Title insurance
Insurance that protects the buyer and the lender, up to the purchase price, if the title to the property turns out to be invalid. It is a one-time fee paid at closing, and lenders require it in nearly all financed purchases.
New Jersey example
Made-up example: a buyer finances a $400,000 house in Edison. Before closing, a title search checks ownership records for liens, judgments and other claims. The lender requires title insurance, paid once at closing. If the title is later found invalid, the policy protects the buyer and the lender up to the $400,000 price.
Official source
Buying a home: consumer guide, New Jersey Department of Banking and Insurance
This is a plain-English summary. Rules and dollar amounts change, so check the official source or a professional before you file or sign anything.