Video compression techniques exploit various types of redundancy in video signals to reduce the data required to represent them. Key techniques include intra-frame compression which uses spatial redundancy within frames via DCT, inter-frame compression which uses temporal redundancy between consecutive frames by encoding differences, and motion compensation which accounts for motion between frames. Popular video compression standards like MPEG use a combination of these techniques including I, P and B frames along with motion estimation to achieve much higher compression ratios than image compression alone.