Ovulation is the process in which the ovaries release a mature egg every month, as a part of female menstrual cycle. There are hundreds of immature eggs within the follicle which release estrogen, which aid in developing the endometrial lining; but only one grows mature enough to be released by the ovary into the fallopian tube. This egg further travels down the fallopian tube into the uterus and gets fertilized in the presence of sperm or gets shed as a part of menstrual discharge
A normal menstrual cycle may range anywhere from 28-32 days and ovulation usually happens within 11-21 days. For a 28 days cycle, the ovulation usually happens on 14th day, considering 1st day of the menstrual cycle as day 1.
Identifying the ovulation helps one plan or avoid conception accordingly.