Ok here is the low down:-
Command and Conquer (developer Westwood) has basic these types or versions quite different from one another and similar also in some sense:-
C & C -- The first one Focusing on the global conflict between the fictional Global Defense Initiative (read "NATO with a budget problem") and Brotherhood of Nod (read "Illuminati meets Warsaw Pact") organizations. They later came out with a Gold edition too. Quite useless though.
C & C (Red Alert) -- Start of one of the most successful series where The Allied forces fight the Russians.......classic cold war battles. Same time frame as Dune2, Warcraft2 both of which excellent games in their own right.
C & C (Red Alert) Counter strike -- An expansion to the Red alert series. Never did well and had nothing much to offer. Quite Forgettable.
C & C (Red Alert) The Aftermath -- Is a heck of a deal that practically turns Red Alert into an entirely new game. Basically an expansion for the original game with new units and maps.
C & C (Red Alert) Covert Operations -- Contrary to belief not a sequel to Red Alert but rather a new game in itself. Flopped badly and nothing much to offer but just stuff put from the original game but with new missions and a cheper price tag.
C & C (Tiberian Sun) -- Tiberian Sun takes few risks, and feels and plays just like the original Command & Conquer. Nothing much to this game after Red Alert.
C & C (Red Alert2) -- Bigger better graphics.
My personal favourite among all the series. Same thing where the Allied and Russians fight each other but an added twist with Yuri (russian side)
C & C (Red Alert2) Yuri's Revenge -- All its new features combine to make Yuri's Revenge ideal or even downright necessary for anyone who enjoyed Red Alert 2. A continuation to the saga of red alert.
C & C (Generals) -- Generals is easily one of the best Command & Conquer games yet, with the impressive visuals and highly refined and accessible gameplay that have come to characterize the best entries in this genre. It includes 3 factions
Usa -- With a very Hi-tech Army at your command
China -- Strenght in numbers
GLA -- Global Liberation Army -- a terrorist outfit faction made out of many rag tag groups but with excessive speed & stealth.
C & C (Generals) Zero Hour -- Yhis is the latest offereing from Westwood. An Expansion pack for Generals. Improve on original gameplay and ensures the longivity for this ever popular C&C series.
The distribuitors for them is
www.gamemasti.com in india. You can buy directly from there as well or from a retailer i guess.
C&C generals -- Rs.1499/-
C&C Yuris revenge -- Rs.699/- (needs original C&C red alert to play!!)