The shape of the Earth is best described as an oblate spheroid.

Here's why:

* Sphere: While the Earth is often depicted as a perfect sphere, it's not quite that simple.

* Oblate: This means it's slightly flattened at the poles and bulging at the equator. This is due to the centrifugal force created by the Earth's rotation.

* Spheroid: This simply means a three-dimensional shape that's similar to a sphere.

So, an oblate spheroid is the most accurate way to describe the Earth's shape.