The document discusses Snappy, a compression/decompression library developed by Google. Snappy provides fast compression and decompression speeds while still achieving fairly good compression ratios. It is optimized for 64-bit x86 processors but aims to be portable. Snappy has been used in several Google systems and projects like BigTable, MapReduce, and RPC. It also sees use in Hadoop. The library is open source under the BSD license and includes language bindings for C++, Java, Python, and other languages.