Aromatase is an enzyme that plays a crucial role in the synthesis of estrogen. It is responsible for converting androgens (male sex hormones) into estrogens (female sex hormones). This process occurs primarily in women, but also to some extent in men. Aromatase is involved in various physiological processes such as the development of secondary sexual characteristics during puberty, regulation of the menstrual cycle and maintenance of bone health in postmenopausal women. In addition, it has been implicated in certain types of breast cancer due to its role in estrogen production.