Increased use of Internet has led to increased sharing, storing, and distribution of the digital media across the globe. In the current era, huge amount of digital media, i.e., text documents, image, audio, and video is being populated and distributed at very fast rate. Therefore, it is very important to maintain the authenticity and copyright information of the digital media. Also, security of the digital media during transmission and receipt is an important issue. It is observed that the digital media is prone to malicious attack and being pirated. Watermarking is one of the solutions for providing the security, authenticity, and copyright to the digital media. Watermarking has been used in many applications in the area of image processing, speech processing, broadcasting of digital media, etc. The basic entities on which watermarking is applied are text documents, images, audio, and video. It becomes important to achieve robustness, security, and imperceptibility while transmitting the data with watermark. Lot of research is already been done in text and image watermarking as compared to audio and video. In this paper, we discussed about important concepts of digital audio watermarking and explain few important applications through the literature survey of various techniques used for it.