A phase of the menstrual cycle in which an ovum (the female reproductive cell) is released into the oviduct. The ovum can be fertilized during this phase, resulting in pregnancy. If the ovum is not fertilized, it is expelled from the body during menstruation.

The female body typically produces more natural lubrication during ovulation than during other phases of the menstrual cycle. Because of an increase in the production of progesterone, some women may also experience an increased sex drive during ovulation.