What is pointer

Pointer (computing) - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Pointer)

A pointer is variable in memory that contains the memory address of something else like a structure or another variable. Pointers can come in handy when passing information to another part of your code because they can represent a large piece of data by simply "pointing" to it. You can pass information to other functions either by just the address (passing by reference) or the data itself. (by value). C# handles pointers a little different so do some reading and have fun.

Try this detailed discussion of Pointers in C:

HowToProgramC : Pointers in C / C++ (http://howtoprogramc.googlepages.com/pointers.htm)