COI Full Form

A certificate of insurance (COI) is issued by an insurance company or broker. The COI verifies the existence of an insurance policy and summarizes the key aspects and conditions of the policy. For example, a standard COI lists the policyholder's name, policy effective date, the type of coverage, policy limits, and other important details of the policy. 

Without a COI, a company or contractor will have difficulty securing clients; most hirers will not want to assume the risk of any costs that might be caused by the contractor or provider.