Binoculars are optical devices that allow users to see distant objects more clearly. They consist of two telescopes mounted side by side, enabling the viewer to use both eyes for a three-dimensional image. Binoculars are commonly used for activities like birdwatching, hiking, and sports events. The lenses in binoculars magnify the view, making it easier to observe details. They come in various sizes and magnification levels, which are often indicated by numbers, such as 8x42, where 8 represents the magnification power and 42 refers to the diameter of the objective lens in millimeters.