The objective of image compression is to reduce irrelevance and redundancy of the image data in order to be able to store or transmit data in an efficient form. Image compression may be lossy or lossless.

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Doesn’t matter if you’re a web dev, mobile dev, or some weird sysadmin who just sends around memes all day. JPGs are a part of your job, and critical to the experience of the users who benefit from that work. Which is why it’s so important to make sure these JPG files are as small as possible.