Aetna is a health insurer that provides health insurance plans to individuals, families, and businesses. It is one of the largest health insurers in the United States and has been in business since 1853. AETNA offers a variety of plans, including traditional health insurance, Medicare Advantage, and Medicaid plans. AETNA also provides supplemental coverage such as dental, vision, and life insurance. AETNA's mission is to provide quality, affordable health care to its members.