A summons is the formal notice telling the defendant that a lawsuit has been filed and that a response is required.
Summons means the formal notice telling the defendant that a lawsuit has been filed and that a response is required within a stated time.
A lawsuit cannot usually move forward in a meaningful way until the defendant receives proper notice. The summons is part of what makes that notice formal and legally recognizable.
The term matters because readers often focus only on the complaint. But the summons is what tells the defendant that the case exists, where it was filed, and when to respond.
The summons appears at the start of civil litigation and is usually served together with the complaint. Courts and rules often specify what information the summons must contain and how it must be delivered.
A business is sued in state court. It receives a summons and complaint, and the summons states the deadline for filing an answer or other response.
A complaint explains the claims. A summons gives formal notice that the lawsuit exists and a response is required. Service of process is the method used to deliver those documents in a legally valid way.