A property purchase transfers ownership rights that were themselves transferred before. A title search examines that history for anything that would limit what the buyer receives.
Ownership is a chain, not a fact
Title to land passes from owner to owner over decades or centuries, and each transfer must have been valid for the current one to be sound.
A defect anywhere in that sequence can survive to the present, because a seller cannot convey more than they actually hold.
The search therefore traces the chain backward through recorded documents, looking for breaks, gaps and transfers that were never properly completed.
Recorded claims attach to the land
Many obligations attach to the property rather than to the person. Mortgages, tax liens and contractor claims for unpaid work all follow the land.
If they are not cleared before closing, the new owner inherits them, which is why a search checks for filings against the property across the relevant public records.
Most are resolved at closing, with proceeds from the sale used to satisfy outstanding claims before the balance reaches the seller.
Easements limit what an owner may do
An easement grants someone else a right to use part of the property, commonly for utility lines, drainage or access to a neighbouring parcel.
These rights survive a sale and can materially affect the property's use, particularly where they cross ground a buyer intended to build on.
Restrictions recorded by a developer or an association can also limit alterations, and these too are found in the record rather than in the physical inspection.
Some defects are not in the record
A search examines documents, so problems that were never recorded remain invisible to it. Forged signatures, undisclosed heirs and errors in earlier filings all fall into this category.
Boundary disagreements can also exist without any recorded trace, resolved only by a survey comparing the legal description against what is physically on the ground.
This gap is precisely why title insurance exists as a separate product, covering losses from defects that a diligent search would not have found.
The record system itself varies
Most American jurisdictions maintain recorded documents indexed by the names of parties, which makes searching dependent on names being recorded correctly.
A minority use a different system in which the state maintains a register of title, and the register itself is conclusive as to ownership.
Practices, timelines and required documents differ by state and county, so anything specific to a transaction should be confirmed with a local professional.