For those not in the know, a teleconverter is a device that you attach in between your camera body and your lens. The point of this device is to extend the focal length of whatever lens you attach to the teleconverter.
Teleconverters come in different "strengths" depending on the level of magnification you desire.
For example, if I used a 2x teleconverter with a fixed 100mm lens, then I'd be able to grab shots as if I were using a 200mm lens. If I used a 1.5x teleconverter, then it would be similar to using a150mm lens.
The main purpose of teleconverters is to extend the reach of lenses that already have pretty long focal lengths to get close-up shots at sporting events and of wildlife in its natural habitat.
Since I've never personally used a teleconverter, I'll turn you over to the following link which does a great job of discussing the pros and cons of such devices.
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