A zoo (short for zoological park, zoological garden, or animal park, and also called a menagerie) is a facility in which animals are confined within enclosures, displayed to the public, and in which they may also be bred.

zoo is a data compression program and format developed by Rahul Dhesi in the mid-1980s. The format is based on the LZW compression algorithm and compressed files are identified by the .zoo file extension. It is no longer widely used. Program source code was originally published on the comp.sources.misc Usenet newsgroup, and was compatible with a variety of Unix-like operating systems. Binaries were also published for the MS-DOS and AmigaOS user communities. A small companion program was also developed, entitled booz, that provides only decompression functionality.