Lincoln National Corporation, through its subsidiaries, operates multiple insurance and retirement businesses in the United States. It operates through four segments: Life Insurance, Annuities, Group Protection, and Retirement Plan Services. The Life Insurance segment provides life insurance products, including term insurance, universal life insurance (UL), indexed universal life insurance, variable universal life insurance (VUL), linked-benefit UL and VUL products, and critical illness and long-term care riders. Its Annuities segment offers variable, fixed, and registered index-linked annuities.