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  2. Image compression - Wikipedia

    en.wikipedia.org/wiki/Image_compression

    Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Algorithms may take advantage of visual perception and the statistical properties of image data to provide superior results compared with generic data compression methods which are used for other digital data.

  3. Lossy compression - Wikipedia

    en.wikipedia.org/wiki/Lossy_compression

    It is possible to compress many types of digital data in a way that reduces the size of a computer file needed to store it, or the bandwidth needed to transmit it, with no loss of the full information contained in the original file.

  4. Snapchat - Wikipedia

    en.wikipedia.org/wiki/Snapchat

    Snapchat is an American multimedia instant messaging app and service developed by Snap Inc., originally Snapchat Inc.One of the principal features of the multimedia Snapchat is that pictures and messages are usually available for only a short time before they become inaccessible to their recipients.