[suupasaiyajin]

Hey guys, I'm new to this backing up stuff. I just started and have made some backups of my PS2 games and now I was going to try to backup my PS1 games, but I have a question. I was reading the threads on here and noticed there are a lot of posts and tutorials about patches for PS games. Well ... what exactly is a patch and what does it do and what is it for?