When would a defendant file a motion to dismiss?

A defendant would file a motion to dismiss primarily when they believe that the complaint lacks sufficient legal grounds to proceed, often citing reasons such as lack of jurisdiction, failure to state a claim upon which relief can be granted, or expiration of the statute of limitations. This motion is typically filed early in the litigation process, often before answering the complaint. It aims to eliminate the case or specific claims without requiring a full trial. If granted, it can result in the dismissal of the case or certain claims against the defendant.