The official world championship is generally regarded to have begun in 1886, when the two leading players in Europe and the United States, Johann Zukertort and Wilhelm Steinitz respectively, played a match.
Though the world championship is open to all players, there are separate events and titles for the Women's World Chess Championship, the World Junior Chess Championship (for players under 20 years of age, though there are younger age events also), and the World Senior Chess Championship (for men above 60 years of age, and women above 50). There are also faster time limit events, the World Rapid Chess Championship and the World Blitz Chess Championship. There is also a World Computer Chess Championship.
According to wikipedia