A summons is a formal legal document that notifies you a lawsuit has been filed against you and orders you to respond within a certain time or risk losing the case by default.
A summons is a court-issued or court-authorized paper served on a defendant to give them notice that legal proceedings have begun. It typically appears at the very start of a civil case, accompanied by a complaint that explains what the plaintiff is suing about.
If you receive a summons, your legal obligations to appear or respond are triggered; ignoring it can lead to a default judgment against you without further warning. It sets the procedural clock running and establishes the court’s authority to hear the case against you.
Many people confuse a summons with an arrest warrant or police citation; but a summons in a civil case is not an order for jail time—it is a demand to participate in a legal dispute. Also, a summons does not mean you are guilty; it only means someone has accused you and the court requires your response.
Get the actual rule
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
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.