The name of the compression algorithm used in standard PNG files, as well as in zip, gzip, pkzip, and other compression programs. Deflate is a member of the LZ77 family of compression methods.
From Portable Network Graphics (PNG) Specification (Second Edition) ( 2003-11-10) name of a particular compression algorithm. This algorithm is used, in compression mode 0, in conforming PNG datastreams . Deflate is a member of the LZ77 family of compression methods. It is defined in [RFC-1951] .
DEFLATE is a lossless data compression algorithm that uses a combination of the LZ77 algorithm and Huffman coding. It was originally defined by Phil Katz for version 2 of his PKZIP archiving tool, and was later specified in RFC 1951.