A camera is made up of various components and they are all of equal importance. The lens is one of these parts and you can't take a photo without some form of lens. Some cameras have a fixed lens, which means it's a part of the camera which cannot be changed or removed. Other cameras have interchangeable or removable lenses and these cameras allow you to change your lenses for different types of photography.
There are various lenses including zoom lenses, telephoto lenses, wide angle lenses, fish eye lenses, manual focus lenses and auto focus lenses. Each lens gives you different photo taking options. A zoom lens allows you to stay in the same position and zoom in on your subject, which will bring the subject closer. Professional photographers use a variety of necessary lenses to get shots they need for work, but many amateurs also use them to get the proper effect in their photos, because their passion for photography. Make sure you protect your lens with a cap when not in use and a filter when you are using it.
Lenses range in price from about $50 to several thousand. Some lenses will give you a different angle of view depending on the format of film you use. Lenses come in different apertures and in auto and manual focus models. Some lenses also have image stabilizers built into them, to help reduce camera shake.