/3/ - 3DCG

So can someone explain to me the different types of "Maps" and how they're used in games?
My understanding? (please correct me)

>Bump Map
Simplistic textures that make points in the surface seem high/low but don't affect silhouette, like pores.
>Normal map
More complicated textures that "fake" where a surface is facing in the render... I don't understand if they affect the silhouette but they seem the most common
>Displacement Map
Changes the silhouette of the model, needs a lot of geometry to displace so isn't used in most games
>Specular Map
Describes how "shiny" a part is
>Alpha Map
Describes how "see through" a part is
>UV Map(ping?)
The process of flattening a model for use in texturing.