.WAV File Extension Description:

File extension WAV refers to Waveform audio format. This is the format used to store audio bitstream in computers developed by Microsoft and IBM. With WAV, data, which is typically raw and uncompressed, is stored in chunks. WAV files can be used on the operating systems of both Windows and Macintosh.

WAV files are capable of holding audio data in a compressed form, such data is normally held in the LPCM, (Linear Pulse Code Modulation) format. This is the file format that is employed in preparation of CDs.

Learn more here: http://wav.file-extension-library.com/