The base of a cylinder is shaped like a circle. A cylinder consists of two circular bases that are connected by a curved surface. The height of the cylinder extends perpendicularly from one circular base to the other.
To visualize, imagine a can of soda: the top and bottom of the can are circles, while the curved part that wraps around is what connects these two circular bases. Because of this circular base, the properties of the cylinder allow for its use in various applications, such as in containers, pipes, and many structural elements.