A popular multi-user, multitasking operating system developed at Bell Labs in the early 1970s, on which much of the Internet was built.

To unzip a file means to decompress, or expand a file that has been made smaller using a compression utility.

stands for Uniform Resource Locator. A URL is a distinct address that locates a specific file on the Internet.

A collection of several thousand online discussion groups, accessible by newsreader software. The Usenet groups are a subset of the various newsgroups available on the Internet.