By evolution in computer and telecommunication, all kind of data is stored and distributed around the globe. However, transmission of this digital data is not much secured .An issue of copyright of data is always a major concern. Data hiding techniques can help preserving illegal distribution of digital data. In this paper we describe one of the vigorous data hiding technique known as digital audio watermarking, which embeds additional indistinguishable information in the audio signal by using discrete wavelet transform algorithm. The changes recorded by embedding and extracting the watermark are verified and displayed using signal to noise ratio as human auditory system(HAS) is far more complex than human visual system (HVS) so to determine noise introduced in watermark we will show result based on signal to noise ratio(SNR).