After the destruction of Sunnydale at the climax of the show, Buffy The Vampire Slayer fans were left with quite an open ending, the final episode ending with no definitive course of action for the cast of characters to take.
However, though the show may now be long finished, the many comic books published by Dark Horse have provided masses of additional content for fans of the Slayer. The books take place one year after the on-screen ending, cannically continuing the story in the form of 'seasons' with each one, similarly to a season of a TV show, being a separate, yet connected, arcs.
The initial author of the comic, Joss Whedon (who also created the show), set up the titular character and Xander as the leaders of one of the ten squads of Slayers operating across the globe in the aftermath of the destruction of Sunnydale.
Story wise this comic really is great and will definitely please fans of the show, with the eighth season seeing season six villain Warren Mears returning and later series regular Harmony Kendall elevating her character status by practically turning the entire world against Buffy and her allies, making for an epic tale.