Yeah. Algorithm is just a word for computational strategy to solve a problem. I'm not sure what you want to study before going to school or if you just want to know what it means, because you'll learn everything in class 🙂. You might want a basic understanding of classes of problems (P, NP -- esp. what NP-complete means) and for putting boundaries on the running times of an algorithm (at least know what Big-O is).
But, really, you'll learn about all that in class. Good luck!