Ritual is part of history and culture and it is not only limited to spiritual aspect, marriage, or religion. Sometimes the term is used when you have several steps in, say for example, applying your beauty products everyday. They call it as beauty rituals. Anything you do daily with several steps to follow that you believe will make you look better can be your own ritual. It's a way for you to throw away something and giving birth to a new thing. Same practice goes with religious rituals that include cleansing yourself before gods or offering something to please your god.