Hey everyone, I am new to this website and I'm glad to be a part of this awesome mathematics community!

I have heard of vectors, but my Calculus class never touched base on them. All I know about vectors is that they have a direction and a magnitude, and cosine has something to do with them. But that's about it. So... how do they work? And what kind of applications use 2D and/or 3D vectors?

Thanks!