 The most important compression algorithm is the discrete cosine transform (DCT), a lossy compression technique that was first proposed by Nasir Ahmed in 1972.DCT-based compression standards include the H.26x and MPEG video coding standards introduced from 1988 onwards, and the JPEG image compression standard introduced in 1992.JPEG was largely responsible for the proliferation of digital images and digital photos which lie at the heart of social media, and the MPEG standards did the same for digital video content on social media.