A spheroid is a three-dimensional geometric shape that resembles a sphere but is slightly flattened or elongated. It can be classified into two main types: oblate spheroids, which are wider at the equator than at the poles, and prolate spheroids, which are elongated along one axis. The Earth is often approximated as an oblate spheroid due to its rotation. Spheroids can be described mathematically using equations that define their dimensions and surface area. They are commonly found in nature and are important in various fields, including astronomy, geography, and engineering, where understanding their properties is essential for accurate modeling and analysis.