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Proof Of Service
Proof of service is a formal document filed with the court showing that you delivered legal papers to the other party in the required way.
What it actually is
It is a written statement, often a form or affidavit, that describes who received the papers, how they were delivered (such as by hand, mail, or a process server), and when. This document becomes part of the court record to confirm that the other side was properly notified of the case.
Why it matters in your case
Without proof of service, the court cannot be sure the other party knows about the lawsuit, which could delay or even dismiss your case. It protects your right to proceed by showing you followed the rules for giving notice.
The common misunderstanding
Many people think that simply mailing or handing papers to someone is enough, but the court requires a separate, sworn proof of service to be filed. The act of serving papers and the proof of that service are two different steps.
Get the actual rule
Definitions are orientation; rules are authority
This page explains the concept. When it matters to your case, read the rule that governs it in your court — we hold Texas, federal and Washington court rules word for word, and every state's official resources are on the state pages. If someone cites a case at you, check that it exists first.
Related
Terms that travel with this one
General explanation, not legal advice, and not specific to any state — procedures and deadlines vary by jurisdiction and court. If you can get a lawyer or free legal aid, do: every real option.