The Sims is a video game series that was developed by Maxis Software and published by Electronic Arts. It might be possible to find cracked versions of the game on torrent websites, but this is firstly of questionable legality and would probably require a download anyway. To play the full game you require a download, a CD and a bar code. Unfortunately it is not legitimately possible to play the full Sims game online without downloading it.
However it is possible to play a free trial version of The Sims 3 if you visit This allows you to trial the game for 60 minutes without paying, although you do need to install a plug-in to be able to do this. For most of the games in the Sims series, you have to buy the game and download it onto your computer in order to play it.