Command & Conquer: Tiberian Sun is the sequel to Command & Conquer: Tiberian Dawn, to be followed by the upcoming Command & Conquer 3: Tiberium Wars in the Tiberian series. The game takes place about 30 years after the end of Tiberian Dawn. In the 2030's, when the Global Defense Initiative (GDI) and the Brotherhood of Nod are again at war in a battle for the future of the world.

Compared to its predecessor, Tiberian Sun relies heavily on science fiction technologies, and introduces a new isometric game engine featuring varying level terrain to give the impression of a true 3D environment.

Source: Wikipedia Article