difference between named additional insured and additional insured
Additional Named Insured. Additional Named Insureds are considered to be owners of the policy. Therefore an Additional Named Insured has full access to the coverage provided by the policy with very few (if any) restrictions. However, the rights afforded to Additional Named Insureds come with risks.
It is just a proof of insurance. Additional Insured: The main contractor is named as an additional insured on the certificate of insurance and is actually given coverage, and has rights under the sub-contractors or vendor's, the Named Insured policy in the event of a future claim.