I am self studying graph theory - and a book has the notation:

The set $\displaystyle Z/nZ$ of intagers modulo n is written Zn (if you know how to use Latex to write the n as postscript characters pls explain - I have 4 PDF on latex and they all seem usless)

My question is - What doesthe set $\displaystyle Z/nZ$ mean - where $\displaystyle Z$ are integers?