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That's the focal range of a zoom lens. Unlike a single focal-length lens (or a "prime" lens) a zoom lens lets you adjust the focal range. "55-200mm" specifies the lens's focal range from 55mm at the low end to 200mm at the long end.
You can read a general description of zoom lenses at http://en.wikipedia.org/wiki/Zoom_lens
Nikon current has two different 55-200mm lenses: http://www.nikonusa.com/Nikon-Products/Product/Camera-Lenses/ 2156/AF-S-DX-Zoom-NIKKOR-55-200mm-f%252F4-5.6G-ED.html and http://www.nikonusa.com/Nikon-Products/Product/Camera-Lenses/ 2156/AF-S-DX-Zoom-NIKKOR-55-200mm-f%252F4-5.6G-ED.html
If you're asking about the L110, it has a permanently-affixed lens and will not use either of the above lenses.
Have you ever heard the expression "Good, Fast, Cheap ...pick any two" ?
Well, it's that situation. The kit lens is cheap, and it has a good zoom range (including wide-angle) but it's not very high quality. The best lens for you is probably the 17-55 EF-S -but it is $1000. It is a great lens, and it's efficient and light sensitive, along with image stabilization.
Without knowing your budget, I would also recommend the 28-135 EF IS, but it doesn't cover the wide angle range. That one is $400.
There's also the 17-85mm, which also has Image Stabization. That one is about $500.