Merchants
Merchants are NPCs which you can buy and sell items from. There are 5 types of merchants: weaponsmith, armorsmith, storage keeper, tool merchant and magical item merchant. You can sell items to and convert coins from all types of merchants.
Weaponsmith
Apart from the basic sell and convert coin operations, you can buy weapons and enchant items. See enchanting for more information.
Armorsmith
Apart from the basic sell and convert coin operations, you can buy armors & shields and enchant items. See enchanting for more information.
Storage Keeper
Apart from the basic sell and convert coin operations, you can open your storages. There are 4 types of storages: personal, guild, bazaar, premium.
Tool Merchant
Apart from the basic sell and convert coin operations, you can buy gathering tools and utility items.
Magical Item Merchant
Apart from the basic sell and convert coin operations, you can buy potions.