It is a group of hormonal formulations that are taken by women to avoid pregnancy. They can be called simply “the pill”.
The pills have in them artificially-created women's hormones which are made in the ovaries. They suppress the ovulation, promote the higher concentration of the of mucus in the cervix, making it impassable for sperm, alter the uterine mucosa, making it impossible to attach an impregnated egg to it, as well as diminish the agility of sperm in the fallopian tubes. These combined actions ensure the prevention of impregnation in almost 100% of cases.
Besides, the pills are used for symptoms relief in menstrual pains, PMS, and endometriosis.