The basic difference is that quiet can mean little or no noise, but silent means ZERO noise. If you describe somebody as quiet, it means that person doesn't talk very much. People can also talk quietly (with a very low volume) but itís impossible to talk silently!
Tony Greig, the former England cricketer, is today a famous cricket commentator. He has been commentating for a long time and though controversial at times, he is a much loved and famous cricket commentator today.
Tony Greig was also famous for having helped Kerry Packer during the World Series Cricket. Packer was so indebted to Greig that he offered him a lifetime job as a commentator on Packers Nine Network. So, soon after leaving the game Tony Greig took up the job as commentator and ever since has been one of the most sought after cricket commentators. He has also been associated with the British network, Channel Four.