An endorsement, also known as an amendatory endorsement or insurance endorsement, is a modification made to an existing insurance policy. It is used to add, remove, or modify the coverage of a policy, tailoring it to the specific needs of the insured. 

It is a way to personalize the coverage and enhance its benefits. For example, an endorsement can be used to include additional protection for specific risks or events. Insurance endorsements can also be used to add or remove beneficiaries, adjust coverage limits, or exclude certain risks.

It is important to note that endorsements are subject to the specific policies and regulations of each insurance company. The availability and scope of endorsements may vary depending on the company.