Zoom lenses are a type of camera lens that allow the user to adjust the focal length and thus change the magnification of the image to be captured. They are characterized by their variable focal length, which is often indicated by two numbers separated by a hyphen (e.g., 200-600mm). This range of focal lengths enables a wider variety of compositions without having to physically move closer to or further away from the subject.

Zoom lenses come in a variety of focal lengths, from wide-angle to telephoto, and are popular among photographers who desire versatility in their shots. They are frequently used in portrait, wildlife, and sports photography.

Their optical quality can vary greatly. However, advancements in technology have significantly improved zoom lenses in recent years.