As long as bandwidth is expensive and people are impatient, data compression is here to stay. The data takes up less storage space and requires less bandwidth to be transmitted over the Internet. In addition, many methods can squeeze multiple files into a single file called an archive. Lossless techniques compress data without destroying or losing anything during the process. Lossy techniques let the file be compressed even smaller, but some data is lost forever.
Lookup entries are part of the compressed file, enabling the decoding program to rebuild the table.
A lossy compression method for video. PKWare Inc. The program uses an algorithm and a data library to encode or archive multiple date files. PKUnzip decompresses the files to their original states. If you're compressing bank records, you want to be sure they're identical before and after. But with an image or audio or video files, it's generally not crucial to restore every bit of data.