Some are extremely common and practiced by the vast majority of the population, while some are extremely obscure. Sorcerers primarily use black magic to summon devils.
The goals of summoning devils include attaining wealth, fame, approval of superiors, sex, or harming another person.
Many of them are now inseparable parts of everyday life, or simply common social etiquette, though they often have their origins in superstition.
The awareness of them, and their perceived importance, depends on various factors including region and age.
Chess has its own aristocracy, the elite playing in super tournaments and matches for the world chess crown.