Rituals are predefined sequences characterized by rigidity, formality, and repetition that are embedded in a larger system of symbolism and meaning but contain elements that lack direct instrumental purpose.
(1) The footballer is going through their pre-game ritual. Don't disturb them.
(2) That fraternity/society has a specific hazing ritual.
(3) Some people perform mating rituals
(4) Religion is known for having many different rituals.