When it comes to art, the word "print" can mean a lot of things. First, there's the real deal: lithographs, woodcuts, screen-prints, and the like. Even though a printmaker might've produced 20 editions of such a work—that's the penciled-in 6/20 in the bottom corner you'll sometimes see—they also had to make the plate, block, or screen that it came from and then manually print each edition on a press. Sometimes they even tediously tear their own paper to get those amazing unfinished edges! So each one of their "prints" is considered an original work of art.
Lots of artists produce and sell art prints for way less than their originals as a way to make some cash flow but also to just get their art out in the world to more people. You're still supporting them by buying one of these if you can't afford the real thing!