Merchants

In Terraria, there are 3 merchant types. These include the Traveling Merchant, Skeleton Merchant, Star Merchant, and, of course, the Merchant.
Traveling Merchant	
Traveling Merchant
Type 	NPC
Environment	Valid houseSurfaceForest
AI Type 	Passive AI
Damage 	12 (Throwing Knife)
Max Life 	250
Defense 	15
KB Resist 	50%
Sounds
Hurt 	
Killed	
* Internal NPC ID: 17
The Traveling Merchant appears as a small chance per dawn, and disappears at night whilst off any players' screens. It doesn't function as a town npc, but will only spawn if there is a valid house available.