Exterior algebra is a type of mathematics that is like a puzzle. It's like you have a box of different pieces and you have to fit them all together. Each piece is called a vector, and it can represent a number or direction. You can add two vectors together by putting them side by side, and you can multiply them by each other by folding them on top of each other. In exterior algebra, you can also do something called the exterior square, which is like a two-piece puzzle. You take two vectors and square them to get a different type of vector called a bivector. Bivectors can help you figure out directions or angles in space.