How is a JPEG file set UP?

A JPEG file is structured in a way that allows for efficient compression and storage of image data. It begins with a header that includes metadata, such as the image width, height, and color depth, followed by a series of segments containing compressed image data. The actual image is stored using the Discrete Cosine Transform (DCT) algorithm, which converts spatial domain data into frequency domain data, allowing for lossy compression. Finally, the file ends with a footer that marks the end of the JPEG data stream.