Hongan-ji (本願寺, Temple of the Primal Vow?), also archaically romanized as Hongwanji, is the collective name of the largest school of Jōdo Shinshū Buddhism (which further sub-divides into the Nishi and Higashi branches). 'Hongan-ji' may also refer to any one of several actual temple buildings associated with the sect.
Read more about Hongan-ji: Early History