First things first. Clips and magazines are not the same thing, and the terms are not interchangeable. Confusing the two is very annoying.
Here’s a simple rule to remember the difference: if it has a spring in it, it is a magazine, not a clip.
A magazine is a spring-loaded mechanism used to load ammunition. With the exception of revolvers and top-break shotguns, most modern firearms load cartridges from a magazine of some sort. Bolt-action rifles and some older military ordnance utilize internal magazines, while most other modern firearms use external magazines.