What is "gzip"
gzip is the name for the compressed data format used by the namesake data compression and decompression application Gzip.
The format is based on deflate of compressed data, with the addition of a file metadata header and a CRC32 checksum. It is defined in RFC 1952. It is commonly used to compress HTTP requests and responses, and also often combined with file format tar.
The most known autonomic (command line) the implementation is GNU zip. The format is also implemented by the library zlib, and in this form used in many applications.