Annuity: A financial product that provides a regular stream of income in exchange for a one-time investment. Annuities can provide a reliable source of income during retirement and help secure your financial future. They come in a variety of forms, such as lump sum payments, fixed annuities, variable annuities, and more, so be sure to do your research before investing. Investing in an annuity can be a wise way to prepare for the future and ensure long-term financial stability.