Freemasonry is a fraternal organization that arose from obscure origins in the late 16th to early 17th centuries probably in the stonemason guilds of Scotland. Freemasonry exists in various forms all over the world, with a membership estimated at around three million. At its heart, Freemasonry is a self-improvement organization. Through three initiation rituals, lectures and other ceremonies, combined with social and charitable activities, Freemasons seek to improve themselves as they improve the communities in which they live. To join, one must believe in a Supreme Being, be upright, moral and honest in character, and be recommended by a Mason.