Most insurance covers future events. Title insurance covers the past, protecting an owner against claims arising from things that happened before they ever saw the property.
Ownership is a chain, not a certificate
American property ownership is established through recorded documents tracing transfers, mortgages, and liens over time rather than through a single government register of owners.
Buying a property means inheriting that chain. Any defect in an earlier link can affect the current owner's rights even though they had no part in it.
Examples include a forged signature generations back, an heir who was never accounted for, or a lien recorded against a prior owner and never released.
The search comes before the policy
Before issuing coverage, a title company examines public records to reconstruct that chain and identify problems that can be resolved before closing.
Most of the work is this search, and most defects found are cleared rather than insured, since a correctable problem is cheaper to fix than to cover.
The policy then covers what the search might have missed, which reframes the product: it is largely paying for diligence, with insurance attached to the residual risk.
Two policies cover two different parties
A lender's policy protects the mortgage holder's interest and is typically required as a condition of the loan. It covers the lender, not the buyer.
An owner's policy is separate and optional in most transactions, covering the buyer's own equity in the property.
Buyers sometimes assume the policy they paid for at closing protects them, when the required one protects the lender and only up to the loan balance.
Premiums are paid once
Unlike homeowners insurance, title insurance is bought with a single payment at closing and lasts as long as the insured holds an interest in the property.
The pricing reflects that the insured risk does not grow over time. The defects that exist at closing are the only ones covered, and no new ones can be added.
Claims are consequently rare compared to other lines of insurance, which is one reason the product attracts regular scrutiny about its cost.
Exclusions define the real coverage
Policies list exceptions, commonly including matters an accurate survey would reveal, rights of parties in possession, and issues created by the insured themselves.
Reading those exceptions is the only way to know what has actually been covered, since two policies on similar properties can differ materially.
Requirements and practices also vary by state, with some regulating rates and others leaving them to negotiation, so the same purchase costs differently in different places.