This book is based on research work during Master of Technology programme in Computer Science and Engineering from Rajasthan Technical University, Kota, Rajasthan (India). This research works was submitted in 2014 for fulfilment of Master of Technology. Book contains existing approaches of text, image, audio, video Steganography, Proposed approach of embedding audio data in RGB image using circle equation. This book also describes algorithms of the procedure and experimental work on Matlab. Different image file format were used to find efficient procedure of steganography audio data in RGB image. Research based book must bring joy and additive knowledge to both writer and reader to make it worthwhile. Many existing works were quite helpful during this research project and transforming into a book. This book is completely based on research and experimental results with their analysis on the basis of different parameters.