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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
compress
1. To feed data through any compression algorithm.
2. The Unix program "compress", now largely
supplanted by gzip.
Unix compress was written in C by Joseph M. Orost, James
A. Woods et al., and was widely circulated via Usenet. It
uses the Lempel-Ziv Welch algorithm and normally produces
files with the suffix ".Z".
Compress uses variable length codes. Initially, nine-bit
codes are output until they are all used. When this occurs,
ten-bit codes are used and so on, until an
implementation-dependent maximum is reached.
After every 10 kilobytes of input the compression ratio is
checked. If it is decreasing then the entire string table is
discarded and information is collected from scratch.