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 (the complaint) (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 Washington State, the process of serving a defendant with a summons or citation, along with a copy of the complaint, is a critical step in the legal process. This procedure ensures due process by officially notifying the defendant of the lawsuit and granting them the opportunity to appear in court to defend themselves. The service of process must be performed in a manner prescribed by law, which may include personal delivery to the defendant, service to someone of suitable age and discretion at the defendant's residence, or by mail, among other methods as outlined in the Washington court rules. 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 decisions regarding the defendant in the case. If the service of process is not conducted according to legal requirements, the court may not be able to exercise jurisdiction, and the lawsuit may be dismissed or delayed.