For some reason, almost everyone starting out in photography wants a big telephoto lens.
Telephoto lenses are any lenses with focal length over 90mm, going as high as 1000mm, although the most common sizes are 300mm and under, with a lens in the 200mm range being the most popular.
Where a wide-angle lens exaggerates the foreground and gives you a wide focus range, telephoto lenses compress objects and make them look closer together like these trees which were actually a good distance apart from each other.
A telephoto lens also has less depth of field at the same aperture than a shorter lens does, making focusing more critical and difficult. But, when you need the reach for a bird or animal that you can't or don't want to approach, nothing beats a big telephoto lens.
Most telephoto lenses are slower, with apertures of f/5.6 common in consumer-level lenses to keep the price and size down, meaning they are not great for low-light photography. Finally, they are expensive.
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