A more thorough explanation:

Definition: Proof of service is a document that is filed in court to show that a party has been successfully served with legal process. It is also known as a return of service or return of process.

Example: If a sheriff serves a summons and complaint on a defendant, the sheriff will file a proof of service with the court to show that the defendant has been properly served. This document will include details such as the date, time, and location of service, as well as the name of the person who was served.

Explanation: The example illustrates how a proof of service is used to provide evidence that legal process has been properly served on a party. This is important because it ensures that the party has been given notice of the legal action against them and has an opportunity to respond. Without proof of service, a court may not have jurisdiction over the party and the case may be dismissed.