Secure digital data communication is always a concern. Cryptography and Steganography are the prominent fields in secure digital data communication. By seeing an innocent image it is very difficult to imagine that, the image is doing the task of a messenger. When an image carries information without the knowledge of an outsider, is called as Image steganography. This paper discusses about various image steganographic techniques in spatial domain such as least significant bit (LSB), pixel value differencing (PVD), Combination of LSB and PVD, Modulus function etc. The comparison among various parameters has been made to determine the efficient technique.