content: There are already plenty of routers between you and your destination with standard internet,       That forward your ip address all along the way as part of your traffic to your requested site.  TOR doesn't do that, it strips all of the normal identifying information from your traffic and encrypts it so that the only ip address the site you're contacting sees is that of the TOR exit node, and the node doesn't have your original address either, only the address of the preceding node hop through the network.  That's why anyone wanting to snoop on it has to expend quite  a bit of resources in order to have a very large number of TOR relays temporarily under their control, so that they can use specialized traffic monitoring algorithms on them to track encrypted traffic. It's hit or miss and it can't go on for long at a time because it eventually gets noticed. Their best results at busting criminal TOR users has been in busting hidden services through the actions of their administrators and hosts in meat space and then hijacking the criminal hidden services themselves and feeding trace programs back to the users through the webpages accessed. The trace calls home from the affected machine after it accesses the site through non-TOR standard internet and reveals the users ip address.