Since the edge of computer keyboards are generally above the level of the desk they are sitting on, wrist rests can be used to reduce the strain on your wrists, especially if you do a lot of typing. Wrist rests come in a variety of styles, colours and compositions, but all are designed to sit in front of your keyboard and provide additional support as you type.
If you spend a large amount of time at your keyboard and find that your wrists are sore, then a wrist rest may be a good idea. You can purchase wrist rests at most computer stores, and from online shops on the Internet.