Cheat Engine?

Call me stupid, but I hear a lot of talk about this BO2 "Cheat engine", what exactly is it and where is the download for it, I'd like to take a look.

Thanks

........Ok

Search it up on google You will probably find their website there

Steps

Go to google.
Write there "cheat engine"
Pick first page popping up.
Find download link.
I can make video tutorial if you ask nicely.