Browse Definitions by Alphabet

U (measurement) - A U is a standard unit of measure for designating the height in computer enclosures and server rack cabinets.
U-SQL - U-SQL is a Microsoft query language that combines a declarative SQL-like syntax with C# programming, enabling it to be used to process both structured and unstructured data in big data environments.
UART (Universal Asynchronous Receiver/Transmitter) - A UART (Universal Asynchronous Receiver/Transmitter) is the microchip with programming that controls a computer's interface to its attached serial devices.
UberFLEET - UberFLEET is a smartphone application that allows partners with Uber, a popular rideshare application, to oversee their fleet drivers.
Ubuntu - Ubuntu (pronounced oo-BOON-too) is a free, open source operating system (OS) based on Debian Linux.
UDDI (Universal Description, Discovery and Integration) - UDDI, or Universal Description, Discovery and Integration, is an Extensible Language Markup (XML)-based standard to describe, publish and find information about web services.
Ultra High-Definition TV (UHDTV) - Ultra-high-definition (UHD) television, also abbreviated UHDTV, is a digital television display format in which the horizontal screen resolution is on the order of 4000 pixels (4K UHD) or 8000 pixels (8K UHD).
ultra wideband - Ultra wideband (also known as UWB or as digital pulse wireless) is a wireless technology for transmitting large amounts of digital data over a wide spectrum of frequency bands with very low power for a short distance.
uncanny valley - The uncanny valley is a common unsettling feeling people experience when androids or humanoid robots and audio/visual simulations closely resemble humans in many respects but aren't quite convincingly realistic.
Unicode - Unicode is a universal character encoding standard that is maintained by the Unicode Consortium, a standards organization founded in 1991 for the internationalization of software and services.
unified communications (UC) - Unified communications (UC) is an umbrella term for the integration of multiple enterprise communication tools -- such as voice calling, video conferencing, instant messaging (IM), presence and content sharing -- into a single, streamlined interface, with the goal of improving user experience (UX) and productivity.
unified communications and collaboration (UCC) - Unified communications and collaboration (UCC) is the collection of technology and software that combines enterprise communication with real-time and asynchronous cooperation capabilities.
unified computing system (UCS) - A unified computing system (UCS) is a converged data center architecture that integrates computing, networking and storage resources to increase efficiency and enable centralized management.
Unified Modeling Language (UML) - Unified Modeling Language (UML) is a standard notation for modeling real-world objects as a first step in designing an object-oriented system.
unified storage - Unified storage -- sometimes called network unified storage or multiprotocol storage -- is a storage system that enables users to run and manage files and applications from a single device.
Uniform Resource Identifier (URI) - A Uniform Resource Identifier (URI) is a character sequence that identifies a logical (abstract) or physical resource -- usually, but not always, connected to the internet.
unique device identifier (UDID) - A unique device identifier (UDID) is a 24-character string assigned to Apple devices.
unique selling point (USP) - A unique selling point (USP), also called a unique selling proposition, is a marketing statement that differentiates a product or brand from its competitors.
unit testing - Unit testing is a software development process in which the smallest testable parts of an application, called units, are individually scrutinized for proper operation.
Universal 2nd Factor (U2F) - Universal 2nd Factor (U2F) is a type of physical authentication device that uses encryption and private keys to protect and unlock supported accounts.
universal basic income (UBI) - Universal basic income (UBI) is a model for providing all citizens of a country or other geographic area with a given sum of money, regardless of their income, resources or employment status.
Universal Naming Convention (UNC) - The Universal Naming Convention (UNC) is a standard for naming resources -- such as files and devices -- that are shared by computers on a network.
Universal Plug and Play (UPnP) - Universal Plug and Play (UPnP) is a standard that lets network devices automatically find, communicate with and control each other.
Universal Process Notation (UPN) - Universal Process Notation is a method for illustrating the steps in a business process.
Unix - Unix -- trademarked as UNIX -- is a multiuser, multitasking operating system (OS) designed for flexibility and adaptability.
unknown unknown - An unknown unknown is unidentified information.
unlocked cell phone - An unlocked cell phone is a cellular telephone that can be used with more than one service provider, allowing a user the flexibility to switch between different networks.
unshielded twisted pair (UTP) - Unshielded twisted pair (UTP) is a ubiquitous type of copper cabling used in telephone wiring and local area networks (LANs).
unstructured data - Unstructured data is information, in many different forms, that doesn't follow conventional data models, making it difficult to store and manage in a mainstream relational database.
unstructured text - The unstructured text collected from social media activities plays a key role in predictive analytics for the enterprise because it is a prime source for sentiment analysis to determine the general attitude of consumers toward a brand or idea.
unzipping - Unzipping is the act of extracting the files from a zipped single file or similar file archive.
upcharge - An upcharge is an additional fee that is added to a bill after a contract has already been negotiated.
uploading - Uploading is the transmission of data from a local device to a remote device.
uptime and downtime - In computing, uptime is a measure of how long a computer or service is on and available.
Uptime Institute's data center tier standards - Data center tiers are a system created by Uptime Institute LLC to describe the availability of infrastructure resources in a facility.
URN (Uniform Resource Name) - A URN (Uniform Resource Name) is a permanent identifier for internet resources that employs the urn scheme.
US Department of Health and Human Services (HHS) - The U.S.
usage-based pricing - Usage-based pricing is a consumption-based pricing model in which customers are charged only when they use a product or service.
USART (universal synchronous/asynchronous receiver/transmitter) - A USART (universal synchronous/asynchronous receiver/transmitter) is hardware that enables a device to communicate using serial protocols.
USB 3.0 (SuperSpeed USB) - USB 3.0 is a Universal Serial Bus (USB) data transfer standard that is backwards compatible with USB 2.
USB flash drive - A USB flash drive -- also known as a stick, thumb or pen drive -- is a plug-and-play portable storage device that uses flash memory and can attach to a keychain.
USB Killer - USB Killer is a device that connects to USB drives and delivers a surge which can damage or destroy unprotected hardware.
USB redirection - USB redirection is a technology that enables an end user to plug an external device into a USB port on their endpoint and access the device from within a remote desktop or application.
USB-C - USB-C, or Universal Serial Bus Type-C, is a standard connection type for mobile and portable devices.
use case - A use case is a methodology used in system analysis to identify, clarify and organize system requirements.
use case diagram (UML use case diagram) - A use case diagram is a way to summarize details of a system and the users within that system.
user account provisioning - User account provisioning is a business process for creating and managing access to resources in an information technology (IT) system.
User Datagram Protocol (UDP) - User Datagram Protocol (UDP) is a communications protocol primarily used to establish low-latency and loss-tolerating connections between applications on the internet.
user experience - User experience (UX) design is the process and practice used to design and implement a product that will provide positive and relevant interactions with users.
user group - In personal or business computing, a user group is a set of people who have similar interests, goals or concerns.
user interface (UI) - The user interface (UI) is the point of human-computer interaction and communication in a device.
User Principal Name (UPN) - In Microsoft Active Directory, a User Principal Name (UPN) is a username and domain in an email address format.
user story - A user story is a tool in Agile software development used to capture a description of a software feature from a user's perspective.
utility computing - Utility computing is a service provisioning model where a provider makes computing resources, infrastructure management and technical services available to customers as they need them.
utility storage - Utility storage is a service model in which a provider makes storage capacity available to an individual, organization or business unit on a pay-per-use basis.
Uuencode (Uuencode/Uudecode) - Uuencode (also called Uuencode/Uudecode) is a popular utility for encoding and decoding files exchanged between users or systems in a network.
UUID (Universal Unique Identifier) - A UUID (Universal Unique Identifier) is a 128-bit value used to uniquely identify an object or entity on the internet.
UX research - User experience (UX) research is the study of learning what end users of a system or product need and want, then employing those insights to enhance the design process for products, services or software.
What is a unique identifier (UID)? - A unique identifier (UID) is a numeric or alphanumeric string that is associated with a single entity within a given system.
What is a URL (Uniform Resource Locator)? - A URL (Uniform Resource Locator) is a unique identifier used to locate a resource on the internet.
What is an uninterruptible power supply (UPS)? - An uninterruptible power supply (UPS) is a device that allows a computer to keep running for at least a short time when incoming power is interrupted.
What is the Unified Extensible Firmware Interface (UEFI)? - Unified Extensible Firmware Interface (UEFI) is a specification for a software program that connects a computer's firmware to its operating system (OS).
What is the Universal Service Fund (USF)? - The Universal Service Fund (USF) is a United States government program that supports telecommunications access and affordability in rural and low-income communities.
What is U.2 SSD (formerly SFF-8639)? - A U.2 SSD is a high-performance data storage device designed to support the Peripheral Component Interconnect Express (PCIe) interface using a small form factor (SFF) connector that is also compatible with standard SAS and SATA-based spinning disks and solid-state drives (SSDs).
What is Uber? - Uber is a transportation and ride-sharing technology company that allows passengers to book rides and drivers to charge fares and get paid via a smartphone app.
What is UCaaS? Unified communications as a service guide - Unified communications as a service (UCaaS) is a cloud delivery model that offers a variety of communication and collaboration applications and services.
What is unified endpoint management (UEM)? A complete guide - Unified endpoint management (UEM) is an approach to securing and controlling desktop computers, laptops, smartphones and tablets in a connected, cohesive manner from a single console.
What is unified threat management (UTM)? - Unified threat management (UTM) is an information security system that provides a single point of protection against cyberthreats, including viruses, worms, spyware and other malware, as well as network attacks.
What is unobtainium? - Unobtainium is a term used to refer to a material that cannot be accessed.
What is unsupervised learning? - Unsupervised learning is a type of machine learning (ML) technique that uses artificial intelligence (AI) algorithms to identify patterns in data sets that are neither classified nor labeled.
What is upskilling and why is it important for your career? - Upskilling is a workplace trend that provides training programs and development opportunities to expand an employee's abilities and minimize skill gaps.
What is user acceptance testing (UAT)? - User acceptance testing (UAT), also called application testing or end-user testing, is a phase of software development in which the software is tested in the real world by its intended audience.
What is user authentication? - User authentication refers to the process of verifying the identity of a user attempting to gain access to a computer network, system or device.
What is user behavior analytics (UBA)? - User behavior analytics (UBA) is the tracking, collecting and assessing of user data and activities using monitoring systems.
What is user-generated content and why is it important? - User-generated content (UGC) is published information that an unpaid contributor provides to a website.
What is USSD (Unstructured Supplementary Service Data)? - USSD (Unstructured Supplementary Service Data) is a GSM (Global System for Mobile) communications protocol that is used to send text messages.