An operating system that originated at Bell Labs in 1969. In 1974, Unix became the first operating system written in the C language. Unix has evolved as a kind of large freeware product, with many extensions and new ideas provided in various versions.

An operating system that originated at Bell Labs in 1969. In 1974, Unix became the first operating system written in the C language. Unix has evolved as a kind of large freeware product, with many extensions and new ideas provided in various versions.

An unmanned aerial vehicle (UAV), commonly known as a drone is an aircraft without a human pilot aboard. Their flight is controlled either autonomously by onboard computers or by the remote control of a pilot on the ground or in another vehicle. The typical launch and recovery method of an unmanned aircraft is by the function of an automatic system or an external operator on the ground.

Unreal Engine is a complete suite of game development tools developed by Epic Games for game developers. Although primarily developed for first-person shooters, it gives everything a game developer needs to start and ship the game. The latest stable version, Unreal Engine 4.8.3 is released on July 29, 2015. The latest updates include: allowing updates of C++ code while the engine is running.

A generic label for describing any corporate information that is not in a database. Unstructured data can be textual or non-textual.  

A Global System for Mobile(GSM) communication technology that is used to send text between a mobile phone and an application program in the network. Applications may include prepaid roaming or mobile chatting.

Uptime is a computer industry term for the time during which a computer is operational. Uptime is sometimes measured in terms of a percentile. 

A plug-and-play interface between a computer and add-on devices, such as media players, keyboards, telephones, digital cameras, scanners, flash drives, joysticks and printers.

USB 2.0 was released in April 2000. It is also called "Hi-Speed", adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s)

USB 3.0 was released in November 2008. The standard defines a new SuperSpeed mode with a signaling speed of 5 Gbit/s and a usable data rate of up to 4 Gbit/s (500 MB/s). A USB 3.0 port is usually colored blue, and is backwards compatible with USB 2.0. USB 3.0 ports come in low-power and high-power variants, providing 150 mA and 900 mA respectively while simultaneously transmitting data at SuperSpeed rates.

The next major revision of the Universal Serial Bus (USB). SuperSpeed USB is ten times faster than USB 2.0, and increases the power output from about 100 milliamps to 900 milliamps.

A USB cable can have numerous types of plug ends, the style of which is called a connector. Connector types include Standard-A, Standard-B, Mini-B, Micro-A, Micro-B, and Micro-AB.

Secure USB flash drives protect the data stored on them from access by unauthorized users. With the constant increase in usage of these drives among consumers and businesses, certain software companies offer software that can protect the data within the USB using a Password.

A use case diagram at its simplest is a graphic depiction of the interactions among the elements of a system. It shows the relationship between the user and the different use cases in which the user/actor is involved. A use case diagram can identify the different types of users of a system and the different use cases and will often be accompanied by other types of diagrams as well.

A repository usually within the Usenet system, for messages posted from many users in different locations. It is essentially a discussion group, and is functionally similar to discussion forums on the World Wide Web. 

A business process for creating and managing access to resources in an IT system. To be effective, an account provisioning process should ensure that the creation of accounts and access to software and data is consistent and simple to administer.