Exploits in Guild Wars are ways that players have found to bend the rules of the game to their advantage like being able to use armor before the right level or earning more money by buying and selling from one vendor to another. These are usually things that aren't meant to be possible but they get past the game developers and are discovered by players. If you want to find GW exploits, visit Skryer, a site containing a lot more GW guides, strategies and cheats.