Cutscenes
Closely related to intro sequences are cutscenes, where normal gameplay is suspended while a short piece of exposition plays out, which may involve a change in the position of the camera (e.g. Dawn of War) or may not (e.g. Half-Life 2).
Developments in software and hardware have allowed more recent games to render their cutscenes within the game engine itself.
Read more about this topic: Intro Sequence