Pathfinder saw the light of day for the first time in 2009, when it took over where the third edition of Dungeons & Dragons left of. 10 years later, Pathfinder is on its second edition and has become a titan of its own.
Just as the legacy of Dungeons & Dragons suggests, this is epic fantasy with brave heroes. Pathfinder takes place in the Paizo Publishing's own world Golarion.
When it comes to the Pathfinder's rules, the roots are again quite obvious, but Pathfinder has been developing the concept from the very beginning, which became even clearer with several exciting innovations in the second edition.