A zoom lens will enable you to change focal lengths without having to actually change lenses. These lenses have variable focal lengths, so you can use them as a wide angle lens for one photo and as a normal or telephoto lens for the next photo, depending on the range of focal lengths on the lens. Some zoom lenses have ranges of basic telephoto settings, from about 70mm to 300mm, or 80mm to 200mm. Other models have wide angle focal length options like 17mm to 35mm. The most popular lenses are all purpose models which range from moderate wide angle to moderate telephoto options. The range of a zoom lens is typically indicated by its widest and narrowest focal lengths. An 80mm to 200mm lens basically zooms between 70mm to 300mm. You can frame images while staying in the same spot with a zoom lens.
Good zoom lenses are ideal for aerial photography and for weddings. Zoom lenses can range in price from about $50 to several thousand. Lenses come in different apertures and in auto and manual focus models.