http://uk.php.net/oop
It's used to access the properties (variables) and methods (functions) of a class, basically a class is a collection of variables and functions, but there's a whole lot more to it than that, and at the end of the day they're really lovely things you really won't want to skip over as they can, if you're writing code that'll constantly get reused, package up code into a nice "cake" rather than bringing around a bag of flour and 600 individual raisins every time you start a project.
