The PSN(Playstation Network) is the most major part of the ps3 system. It allows you to get people you knows ps3 username and it means that once you are friends with them, you can talk to them, send images to them, and even play games with them.You can connect to the internet using an ethernet cable which connects straight to your modem or, if you have a wireless modem, you can get on the internet by connecting wirelessly to your modem.
If you are connected to the internet, you can also browse the web and do whatever you like as if you were using a normal computer
If you are connected to the internet, you can also browse the web and do whatever you like as if you were using a normal computer