How many sides does an octagon have?

An octagon is defined as a polygon that has eight sides and eight angles. The term "octagon" is derived from the Greek words "okto," meaning eight, and "gonia," meaning angle. This shape can be regular, with all sides and angles equal, or irregular, with varying side lengths and angles. Recognizing the characteristics of polygons, such as the number of sides, is fundamental in geometry, as it helps build foundational knowledge essential for understanding more complex geometric concepts. Thus, the correct answer reflects the fundamental definition of an octagon within the study of shapes.