An orbital period is the time it takes for an object to complete one full orbit around another object in space. For example, the Earth has an orbital period of about 365.25 days as it revolves around the Sun. This period can vary significantly depending on the distance between the two objects and their masses. Different celestial bodies have different orbital periods. For instance, Mars takes about 687 Earth days to orbit the Sun, while Mercury completes its orbit in just 88 Earth days. These variations are influenced by gravitational forces and the shape of the orbits, which can be elliptical rather than perfectly circular.