Entire books have, are being, and will be, written about SVG (an abbreviation for Scalable Vector Graphics). SVG is an important technology for responsive web design as it provides pin-sharp and future-proof graphical assets for all screen resolutions.
Images on the web, with formats such as JPEG, GIF, or PNG, have their visual data saved as set pixels. If you save a graphic in any of those formats with a set width and height and zoom the image to twice its original size or more, their limitations can be easily exposed.
Here's a screen grab of just that; a PNG image I've zoomed into in the browser:
Figure ...
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