What is a Additional named insured?

Individual added to a life insurance policy other than the insured named in the policy. For example, an insured father can have a dependent son and daughter added to the policy as additional insureds. In many instances, adding an additional insured to an existing policy is less expensive than purchasing a separate policy for that insured.

In property and liability insurance: another person, firm, or other entity enjoying the same protection as the named insured.