Online STOCKS/SHARES Trading sites?

Is there anywhere on the internet when a person can trade in stocks and shares for free without using real money to simply see how it all works etc?

In the UK we have fantasy football where you pretend you are a manager and can make up a team of real players etc and I know there are maybe 1 or 2 stock trading games around perhaps but is there any shadow trading sites online?

Thanks x

Yes, there are many … however all they ‘teach’ you is to be totally reckless and take massive risks ….