A Delaware Certificate of Service is a legal document issued by the State of Delaware that verifies that a legal document was served on an individual or entity. The Certificate of Service includes the name of the recipient, the date of service, the method of service, and the signature of the server. There are two types of Delaware Certificates of Service: personal service and substitute service. Personal service requires the server to personally deliver the document to the recipient, while substitute service requires that the document be delivered to the recipient through another method, such as mail or email. The Certificate of Service must be included with the legal documents being served and is an essential part of ensuring that the service is valid.