Step 1: Identify the legal meaning of cause of action.
In procedural law (including the Code of Civil Procedure), a cause of action is the bundle or aggregate of facts that entitles a person to seek a judicial remedy or relief from a court of law.
Step 2: Distinguish from related concepts.
An interim order is a temporary court direction; evidence produced by a party is distinct from the cause of action itself, which pre-exists litigation.
Step 3: Confirm the definition.
A cause of action is specifically the set of facts that gives the plaintiff the legal right to sue the defendant and claim relief.
\[ \boxed{\text{The bundle of facts which give a person a right to sue for relief in court}} \]