A period is when a person bleeds from their vagina for a few days each month.
Periods are part of the menstrual cycle, which happens to prepare the body for pregnancy. Each month your ovary releases an egg. If that egg remains unfertilised (is not met by a sperm) the lining that was growing in the womb (uterus) to house a fertilised egg will leave the body – this is what a period is.
People lose around 5 to 12 teaspoons of blood during each period. This might sound like a lot but it’s completely normal!