Attachment is a legal process that allows a plaintiff's property to be seized before a final judgment to secure potential payment of damages. It serves to acquire jurisdiction over a defendant when service is not possible and to create a lien on a defendant's property until a plaintiff can obtain a judgment. An order of attachment is issued by a court based on an affidavit and bond showing a valid cause of action exists. The property is then seized by a sheriff. A defendant can challenge an attachment by making a deposit or posting a bond. Certain properties are exempt from attachment.