The BZip2 algorithm is an implementation of the Burrows-Wheeler Transform with Huffman encoding. It is used by the UNIX and Linux BZip2 program. It offers significantly better compression than Deflate but takes longer to compress and decompress data. Xceed Software tests have shown BZip2 to often achieve between 20 to 30% better compression than Deflate on many popular file types such as database, picture, text and executable files.