A video codec is an electronic circuit or software that compresses or decompresses digital video. When executed, the decompressor transparently decompresses and runs the original application. The viewer's set-top-box decoder decompresses the delivered bitstream, and displays the program on-screen. The following script decompresses a zipped file and splits it into evenly sized partitions. As the shock wave decays, the shocked region decompresses towards more usual pressures and densities. Varying pressure decompresses some vapor pockets which subsequently implode. It decompresses the audio bit-stream. The program decompresses more than 20 popular archive formats. When information needs to be read, the utility decompresses the information.