Hidan is a rogue ninja from the Village Hidden in the Hot Springs which deteriorated from a ninja village to a tourist site. Hidan became infuriated by this as he believed that shinobi were meant to kill and thus slaughtered his neighbours before leaving his village and joining the cult-like faith known as Jashin.
Hidan's main advantage is his inability to die, a result of extensive experimenting with the Jashin religion's various jutsu. His immortality allowed him to survive numerous fatal injuries. This inability to die is the primary reason for his partnership with Kakuzu, since he couldn't kill him, Kakuzu didn't need to find new partners after his fits of rage.