A sphere is a three-dimensional shape that is perfectly round and has no edges or corners. It is similar to a ball or a globe. The surface of a sphere is uniformly curved in all directions, and all points on the surface are equidistant from the center. This makes a sphere symmetrical and gives it the property of having the maximum volume for a given surface area. Examples of objects that are shaped like a sphere include planets, marbles, and basketballs.