What is actually searched. The subject is the public record, held by a county recorder, register of deeds, clerk or equivalent office, plus court and taxing-authority records. The searcher assembles the instruments affecting the parcel and reads them for four categories of problem. The first is the chain of ownership, meaning the sequence of recorded conveyances from some established point forward, and any break in it. The second is liens: mortgages and deeds of trust, judgment liens against an owner, unpaid property and income tax liens, and liens claimed by contractors and suppliers. The third is rights other people hold in the land, such as utility and access easements, rights of way, and mineral or water rights that were severed from the surface long ago. The fourth is restrictions on use, chiefly recorded covenants and subdivision or association declarations.
Priority is the reason sequence matters as much as content. A recorded interest generally takes its rank from when it was recorded, so the same three liens in a different order produce completely different outcomes at a sale. This is why a search is not a checklist of whether something exists but a reconstruction of what happened in what order, and why the recording act of the state in which the property sits is doing the real work underneath it. Recording, and what a deed does, are covered on the deed page.
What the buyer actually receives. The raw search results usually go to the examiner rather than to the buyer. What the buyer and lender see is a title commitment, called a preliminary report or prelim in some states: the insurer's offer to issue a policy, conditioned on stated requirements being satisfied before closing and subject to stated exceptions that the policy will not cover. The requirements are the practical output of the search, because they are the list of things somebody has to fix: a release of a paid-off mortgage that was never recorded, a satisfaction of a judgment, a signature from a spouse with a marital interest, a probate document establishing that an heir can convey. The exceptions are read against the policy rather than against the search, and the title insurance page covers that reading.
What a search cannot do, stated precisely. Two limits are structural rather than a matter of care. First, the record contains only what was recorded, so a forged deed that was recorded looks valid on its face, an heir nobody knew about leaves no trace, and an unrecorded easement by long use is invisible. Second, a human being read the records, and a competent searcher can still miss an instrument or misjudge an ambiguous one. Neither limit is fixed by searching harder. They are the reason the title insurance product exists, and its page covers what the policy does about them.
Who orders it, who pays, and whether you can shop. Custom varies by state and by county, and it is negotiable in the contract more often than buyers realize. On a federally related mortgage the Loan Estimate splits closing costs into "Services You Cannot Shop For" and "Services You Can Shop For" (12 CFR 1026.37(f)(2) and (f)(3)), and both subheadings require any item that is a component of title insurance or is for conducting the closing to be labeled beginning with "Title —". Which side of the line a given title item falls on depends on whether the creditor permitted the consumer to shop for it, under 12 CFR 1026.19(e)(1)(vi)(A). So the answer is on the form: read the two title blocks and see which one the search sits in.
One statutory rule cuts across all of this. Section 9 of the Real Estate Settlement Procedures Act, 12 U.S.C. 2608, provides that no seller of property being purchased with the assistance of a federally related mortgage loan "shall require directly or indirectly, as a condition to selling the property, that title insurance covering the property be purchased by the buyer from any particular title company," and makes a violating seller liable to the buyer for three times all charges made for that title insurance. It is narrower than it is usually described: it constrains the seller, and it is about the title insurance, not about every service in the bundle.
A defect found is not the same as a deal lost. Most of what a search turns up is routine and gets cleared from the seller's proceeds at closing, or gets written into the policy as an exception the buyer accepts. What a cloud on title is, and how the categories differ, belongs to the term for title defects.