Final answer:
A quiet title action is the court action taken to remove a cloud on the title and ensure a clear and marketable title for a property owner.
Step-by-step explanation:
The court action taken to remove a cloud on the title is called a quiet title action. A cloud on the title refers to any claim, lien, or encumbrance that may affect ownership or create uncertainty about the validity of the title to a property. A quiet title action is a legal proceeding that resolves any disputes or doubts about the ownership or title of a property, ensuring a clear and marketable title for the owner. It is often necessary when there is some issue or "cloud" that could cast doubt on the legal ownership, such as discrepancies in property descriptions, claims by missing heirs, or disputes involving easements.