Maths and game development goes hand in hand. In order to program games you need a firm grasp on a few mathematical concepts. Vector maths is one of such concepts and comes in handy during various phases of game development be it programming gameplay or coding a graphics pipeline for that fancy lighting you want. So lets not rant too much but dive right into it.
What is a vector?
Put simply vector is a direction. It also has a magnitude but we are mostly not interested with it in game development.