A rangefinder is a device used to measure the distance from the observer to a target. It works by using various methods, such as laser technology or triangulation, to calculate the distance accurately. Rangefinders are commonly used in activities like hunting, golfing, and surveying, where precise distance measurements are essential. There are two main types of rangefinders: optical and electronic. Optical rangefinders use lenses and mirrors to determine distance, while electronic rangefinders, often referred to as laser rangefinders, use laser beams to measure distance. Both types help users make informed decisions based on accurate distance data.