Vendors sell many different things and offer many different services. Most of them will repair your armour and buy your junk!
“A Master of Apprentices is an NPC that let's your character choose or change their crafting...Master of Apprentices
“A Medium Armoursmith is an NPC who sells Medium Armour. Medium Armoursmiths can be found in:Medium Armoursmith
“A Stable-master is an NPC who who you rent horses from to travel about the world. They are...Stable-master
“A Weaponsmith is an NPC who sells weapons. There are usually two together, because one sells...Weaponsmith (Vendor)
“A Light Armoursmith is an NPC who sells Light Armour. Light Armoursmiths can be found in:Light Armoursmith
“A Notary is the NPC you go to when you want to choose your surname, or update your family tree...Notary