The keyword directly refers to the specific distribution archive file zlib-1.2.13.tar.xz . This compressed tarball contains the source code for version 1.2.13 of zlib , an foundational, patent-free, lossless data compression library. Written by Jean-loup Gailly and Mark Adler, zlib implements the DEFLATE compression algorithm used universally in gzip, PNG images, and PKZIP.
zlib is a widely used library for data compression. It provides a high-level interface for compressing and decompressing data using the DEFLATE algorithm, which is also used in ZIP and gzip. zlib is essential in many software applications and protocols, including HTTP, for reducing the size of data transferred over the internet. zlib1213tarxz