The difference between a "magazine" and a "clip."
It's kind of a food chain thing.
You see, a "clip" feeds a "magazine" and a "magazine" feeds the weapon.
If you have used 5.56 or 7.72 bandoliers, then you have experienced the "stripper clips" that, when combined with a "stripper clip guide" (supposed to be included in the bandolier), allow you to load five rounds of 7.62 or ten rounds of 5.56 into a magazine with one stroke of your thumb.
The magazine is then inserted in the weapon to feed it ammuntion.
A lot of confusion about these two terms was caused by the M1 Garand rifle.
It has an internal magazine, much like the 1903 Springfield but has the unique distinction of being one of the few weapons ever produced in which the clip is actually fed into the magazine and stays there while the rounds are being fired. The clip only holds the round for the spring in the magazine to push them into the path of the bolt, which feeds them to the chamber.
Thus millions of vets referred to the item, carrying 8 rounds, they shoved into their rifles (correctly) as "clips." There are not any other commonly used weapons that use this system, wherein lies the confusion.
Clips simply hold rounds for feeding. They do not have any springs or other mechanism for moving or pushing the rounds into place for feeding. This is the distinction between a "clip" an a "magazine."
The device holding 17 rounds you shove into the bottom of your standard Glock pistol is rightly called a "magazine."
The metal device which holds eight rounds that you shove into the top of your Garand is a "clip." The thin piece of sheet metal holding ten rounds, you use to feed them rapidly into your 30 round M16 magazine, is called a (stripper) "clip." The metal box holding twenty rounds you shove into the bottom of your M14/M1A is a magazine.
The Garand is "clip fed."
The M14 is "magazine fed."
You are unlikely to have clip fed weapon other than a Garand.
Therefore, unless you're talking about your Garand, when you say, "clip" you probably really mean "magazine."