A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

U
Underline
Underline is a tag in HTML. You make an underline like this:<u>text</u> In a browser, it looks like this: text

Unix
Unix, along with Linux and Windows is one of the most commonly used and oldest operating systems. Unix is very robust and can be run on just about any hardware platform available. Many Web servers use Unix, but it has a broad range of other uses, such as banking, video games etc.

User Interface
A computer science term, an interface is the point of communication between a computer and an external entity, (in this case, a user). It is a term often used when someone wishes to describe how a Web page is designed in terms of usability. A "good" user interface will be intuitive and easy to use. A "bad" user interface is confusing and difficult.