The defendant in a lawsuit must be served (delivered) a summons or citation (an order from the court to appear and answer the lawsuit) and a copy of the lawsuit (1) to provide due process (fairness) by giving the defendant notice of the lawsuit and the opportunity to appear in court and defend the lawsuit; and (2) to give the court personal jurisdiction (authority) over the defendant.
In Arizona, as in all states, a defendant in a lawsuit must be properly served with a summons or citation and a copy of the complaint initiating the lawsuit. This requirement is fundamental to the due process rights guaranteed by the U.S. Constitution, ensuring that the defendant is given fair notice of the legal action against them and the opportunity to appear in court to defend themselves. Service of process must be carried out in accordance with Arizona Rules of Civil Procedure. Typically, this involves delivering the documents to the defendant personally, but there are other methods such as service by registered mail, publication, or through a designated agent if personal service is not possible. Proper service of process is also necessary for the court to establish personal jurisdiction over the defendant, which is the court's authority to make legal decisions affecting the defendant's rights. If a defendant is not served correctly, they may challenge the court's jurisdiction, and the case may be dismissed or delayed until proper service is achieved.