An annuity is a contract with an insurance company. You pay a premium, or premiums where permitted, in exchange for benefits described in that contract. Some designs emphasize accumulating value for later use. Others emphasize income beginning relatively soon or at a future date.
The category alone does not tell you how a contract works. Interest provisions, income choices, charges, guarantees and beneficiary rules vary. Compare the actual terms with the job you want the annuity to do.
An annuity may be worth exploring when a defined portion of your resources has a long-term purpose. It requires more caution when the same money may be needed for emergencies, a large purchase or changing family responsibilities.
Keep six considerations together: accumulation, retirement income, longevity, contractual principal protection, liquidity and legacy. A feature that supports one priority can restrict another. A lifetime payment option, for example, may change access to the remaining value and what beneficiaries receive.