Final Fantasy was created for the Nintendo Entertainment System in Japan in 1987 and in North America in 1990. The story focuses on the four "Light Warriors" and their elemental orbs, which have been darkened by four Elemental Fiends. Final Fantasy introduced many concepts to the console RPG genre.

Final Fantasy II was originally released in Japan in 1988. The story centers on four youths who join a resistance to end the Emperor's military campaign against the world. Final Fantasy II was the first game to introduce Chocobos and Cid, a important character.

Final Fantasy III was released in Japan in 1990. The plot focuses on four orphaned youths who come across a crystal, which grants them power and instructs them to restore balance to the world. It was the first game to implement a Job System, summoning and introduce Moogles.

Final Fantasy IV was released on the Super Nintendo Entertainment System in 1991. The story centers on a Dark Knight and his trip to save the world from the evil Golbez features an expanded version of the Job System from Final Fantasy III.

Final Fantasy V was created in Japan in 1992. It is the story of a wanderer and his allies as they prevent the resurgence of Exdeath. It features an expanded version of the Job System from Final Fantasy III.

Final Fantasy VI was released on the Super Nintendo Entertainment System in 1994, but it was released in North America under the title Final Fantasy III. The plot centers on a group of rebels as they attempt to overthrow an imperial dictatorship. It has more battle customization options than its predecessors, as well as the largest playable cast in the series.

Final Fantasy VII was released on the PlayStation in 1997 and was the first title to be officially released in Europe. The story centers on a group of adventurers as they battle a powerful corporation. Final Fantasy VII was the first game in the series to use 3D computer graphics, which feature fully polygonal characters on pre-rendered backgrounds. This is the first Final Fantasy to have the same number designation in America and Japan since the original game was released.

Final Fantasy VIII was released on the PlayStation in 1999. The plot focuses on a group of young mercenaries who seek to prevent a sorceress from manipulating an international war. It was the first game in the series to consistently use realistically proportioned characters, and feature a vocal piece as its theme music.

Final Fantasy IX was released on the PlayStation in 2000. The story begins with the protagonists attempting to stop a war sparked by an ambitious queen. It returned to the series' roots by revisiting a more traditional Final Fantasy setting.

Final Fantasy X was released on the PlayStation 2 in 2001. The story focuses on the protagonists trying to defeat a rampaging force known as Sin. Final Fantasy X introduced fully three-dimensional areas and voice acting to the series, and it was the first to spawn a direct sequel (Final Fantasy X-2).

Final Fantasy XI was released on the PlayStation 2 and PC in 2002, and later on the Xbox 360. The first MMORPG in the series, Final Fantasy XI is set in Vana'diel, where players can experience hundreds of quests and stories. It is also the first game in the series to feature real-time battles instead of random encounters.

Final Fantasy XII was released for the PlayStation 2 in 2006.The game takes place in Ivalice, where the empires of Archadia and Rozarria are waging an endless war. It features a real-time battle system similar to Final Fantasy XI, a "gambit" system that automatically controls the actions of characters, and a "license board" that determines which abilities and equipment the character can use.

Final Fantasy XIII is in development for the PlayStation 3. It will be the flagship installment of the Fabula Nova Crystallis Final Fantasy XIII compilation.

My source was wikipédia.