The shape of the Earth is often described as an oblate spheroid. This means it is mostly spherical but slightly flattened at the poles and bulging at the equator. This shape is due to the Earth's rotation, which causes the equatorial region to extend outward. The concept of an oblate spheroid can be traced back to early scientific observations and has been confirmed through various methods, including satellite imagery and measurements. The Earth's shape affects gravity, climate, and ocean currents, making it an important factor in understanding our planet's dynamics and environment.