A beneficiary is simply whoever you designate to receive a specific account or policy's assets when you die — and naming one correctly matters more than most people realize, because of one detail that surprises a lot of families after the fact. * Beneficiaries can be named on almost any account with a death benefit: life insurance policies, 401(k)s, IRAs, and even regular bank or brokerage accounts through what's called a payable-on-death or transfer-on-death designation. Most of these let you name more than one type: a primary beneficiary, who's first in line, and one or more contingent (backup) beneficiaries, who inherit only if every primary beneficiary has already died. * Naming a beneficiary is usually just a form, either on paper or through your account provider's website — but be specific. Providing a full legal name, relationship to you, and ideally a date of birth or Social Security number makes it much easier for the company to verify and locate the right person when the time comes, rather than a first name alone that could match multiple people. * The detail that catches families off guard: beneficiary designations on an account override whatever your will says about that same asset. If your will names your children as heirs to "everything," but an old 401(k) beneficiary form still lists an ex-spouse from years ago, the ex-spouse legally gets that account — the will doesn't get the final say on assets with their own beneficiary designation. * If you never name a beneficiary at all, or every named beneficiary has died before you, that asset generally has to go through probate instead — the court process that can take months and cost a percentage of the estate's value, exactly the kind of delay a proper beneficiary designation is meant to avoid.