What does a wicket keeper do in cricket?
Wicket keeper will dismiss a batsman if he catches a ball nicked by the batsman's bat, which is also called an edge if the ball was cached before it touched the ground. Wicket keeper can also catch a ball returned from the fielder when it was hit in the outfield. Beside that keeper act as a captain, cheering encouraging and leading his team, usually can see things that captain may miss. Here are some good wicker keeping tips here http://www.wicketkeepingtips.com/.
How does a wicket keeper look like?
He stands right behind the batsman in the position to catch the ball. He is the only fielder who wears special gloves and some protective equipment such as leg pads.
What are the best wicket keepers in the world?
According to http://en.wikipedia.org/wiki/Wicket-keeper top 3 from the top 10 wicket keepers worldwide at this moment are: Mark Boucher from South Africa, Adam Gilchrist from Australia and Ian Healy also from Australia.