The volume of a sphere is the amount of space it occupies. It can be calculated using the formula V = \frac43 \pi r^3 , where V represents the volume and r is the radius of the sphere. The constant \pi (approximately 3.14) is a mathematical value that relates the diameter of a circle to its circumference. To find the volume, you first measure the radius, which is the distance from the center of the sphere to its surface. By plugging this value into the formula, you can determine how much space is inside the sphere, which is useful in various fields like geometry and engineering.