Once you have all have the necessary parts for your PC build you’ll then need something to put it all into, and that is the purpose of the PC Case.
Case’s have evolved from just being a metal frame with a metal cover to gorgeous showcases that not only highlights the parts inside but also in itself is already a work of marvel.
When you have a casing in mind it is also prudent to keep in mind the overall cooling solution of your PC build. Whether you’ll be using fans or liquid-cooling for your CPU or GPU, placing them inside the casing can be a handful.
So the casing and cooling solutions go hand-in-hand.