What is the purpose of ovulation

Ovulation occurs when an egg moves from the ovaries into the fallopian tubes and is ready for fertilization. It occurs midway in a woman's menstrual cycle, but the timing varies for each woman.

Ovulation is one part of the female menstrual cycle whereby a mature ovarian follicle discharges an egg. it is during this process that the egg travels down the fallopian tube where it may be met by a sperma and become fertilised.

so basically that process is what makes you able to become pregnant.