What is the Earth's true shape?

The Earth is predominantly an oblate spheroid, meaning it is mostly spherical but slightly flattened at the poles and bulging at the equator. This shape is due to the rotation of the Earth, which causes it to be slightly wider at the equator than pole-to-pole. 1

The concept of Earth as a perfect sphere is a common simplification, but scientifically, its actual shape is more complex due to slight irregularities caused by its rotation and other factors such as gravitational forces. 2