Digital audio watermarking is very popular in recent research area, watermarking is a method to hide information signal into digital form based on spread spectrum, The identity of the owner of the audio file can be invisible in the audio file which is called Watermark Therefore, digital audio watermarking is the process in which whole data into the audio file in such a way that the audibility of the audio is not affected. In this paper, various methods of audio-watermarking have been discussed, which is used to protect right owner by using watermark as a part of that audio, image and video data to eliminate watermark from data is very difficult if someone copied information so watermark also carried with copy and data can carry various authentication etc.