An innkeeper is an NPC, typically inside an inn, that offers characters the opportunity to create a binding point for a . Most innkeepers are also either general goods vendors or food and drink vendors, though some innkeepers do not sell anything at all. In the uncommon case that an Innkeeper is not also a merchant, his/her only reaction to being spoken to is to set your home to their inn.
When using the tracking system with the minimap they will appear with a hearthstone () at their locations. This may not always help as some locations that may contain an inn may not contain an innkeeper.
As of patch 2.3, your pointer changes when you move it over an innkeeper NPC who you can bind to: