U

UPS (Uninterruptable Power Supply) –

Generally a device that allows a system to maintain operation when changes to the power supply would otherwise interrupt the function of that system. They can range from a 9 Volt battery backup to a generator.

Up-selling –

Offering customers additional recommendations when they are placing an order.

Uptime –

The percentage of time a service (web-hosting service, operating system, etc.) is up and running.

URL (Uniform Resource Locator) –

The global address of resources on the Internet. The first part of the address indicates what protocol to use, and the second part specifies the IP address or the domain name where the resource is located.