Joint Photographic Experts Group (JPEG) JPEG is an image format in which lossy compression technique is used to reduces the size image by discarding details which are hard to notice by human eye.JPEG supports 16 million colors and therefore are better for images such as digital photographs and sceneries.But this format is not good for drawings (Drawings with straight line and block diagrams),Clip arts and text based images.The level of compression determines the end file size.

Moving Picture Experts Group (MPEG) is popular digital video compression standard and is pronounced as empeg.The basic idea in JPEG is to reduce images size by removing details in the image which is normally not perceivable by the human eye.MPEG compression(it is also lossy compression) also uses same techinque as JPEG for a particular frame(intra frame) but in addition to that it uses inter-frame compression in which it checks successive frames and identifies frame that can be removed if there are two identical successive frames.Thus by using combination of intraframe and interframe it reduces size of digtal video file to a greater extent.Discrete Cosine Transform (DCT) is the technique that is used in MPEG compression.