Imagine a square as the base, like a flat piece of cardboard cut into a perfect square. Now, picture a point directly above the center of that square. Connect each corner of the square to that point. You've just visualized a square pyramid!

Here's what it looks like:

* Base: A square

* Sides: Four triangular faces that meet at the top point

* Apex: The point at the top where all the triangular faces meet

Think of the pyramids of Egypt, but with a square base instead of a triangular one.

Let me know if you'd like me to describe any other geometric shapes!