Final Fantasy X is the tenth installment in the Final Fantasy series. It follows the story of Tidus and Yuna. It was the first Final Fantasy to appear on a sixth-generation console (i.e., the PlayStation 2, Xbox or GameCube).
Due to Final Fantasy X's success and popularity, it spawned the first-ever direct game sequel to a Final Fantasy game: Final Fantasy X-2, released in 2003-04, and continued the events of Spira two years later through the eyes of Yuna. This came about as the result of an initial concept of spinning off Yuna and Rikku into individual titles of their own, which was later combined into one game.
It is also the first in the series to use voice-overs, instead of the previous method of scrolling subtitles. The implementation of voice-overs limited the player's ability to change the name of the characters, however. Tidus is the only playable character whose name you, as the player, are able to change. Aeons can also be renamed. It is the first installment in a long time in which most of the main characters do not have last names.
- http://finalfantasy.wikia.com/wiki/Final_Fantasy_X