[Tex/LaTex] How to type & in LaTeX?

characters

Possible Duplicate:
Escape character in LaTeX

I'm trying to type the word & but I encounter with error :

misplaced alignment tab character &

And when I put it into verbatim it will show Q&A in a seperated line!
So how should I type & in LaTeX?

Type \&. This is a very basic question covered by all introductory material on LaTeX. You should consider taking a look into such an introduction (for example lshort.pdf, 1.3.2).