A zoom lens has multiple focal lengths in a lens. Because the lens elements can move, it's possible to zoom in and out. This allows you to bring your subject closer without having to move yourself. There are several variants of zoom lenses, with a fixed aperture or with a variable aperture, with a large zoom range or a smaller zoom range. They are all-rounders and very suitable to take with you on a trip. Pay attention to the mount when purchasing a lens. Check if it's suitable for your camera.