Data compression is very important for the 'online world'. When visiting a website, all the picture files that our browser downloads (file extensions like .png, .jpg and .gif) are all compressed. This also includes videos when online.
Files that are relatively large can be compressed so that they are smaller in size. For example, if an mp3 file is 20MB originally, it can be shrunken to around 3-4MB through compression. This makes it easier to transfer data across the Internet (whether by downloading or uploading).
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