In one sentence: Structured data is code added to a web page in a shared vocabulary that labels the facts on that page, so software reading it knows which text is your business name, your hours, your address, your services, or your reviews instead of guessing from the layout.
A person looking at your contact page can tell at a glance that the ten digits near the top are a phone number and the grid underneath is when you are open. Software cannot, at least not reliably. It sees text arranged on a screen and works from patterns.
Structured data settles the question by adding a block of code that names each fact outright: this is the business, this is the phone, these are the hours, this is the area served. Nothing changes for a visitor. Almost none of it ever appears on the screen, which is why most owners have no idea whether their own site carries any. The page simply stops being ambiguous to anything reading it without eyes.
The vocabulary being shared is the part that makes it work. Everyone writing these labels uses the same words, so a label for opening hours means the same thing on your site as it does on a hospital's.
Two audiences use it. Search engines read the labels to build the richer results you already recognize in a list, the ones showing a rating, a price, or a question that expands. Answer engines use them differently: when a system is assembling a summary and has to state who is open on a Sunday, a labeled fact is cheaper to trust than a paragraph it has to interpret.
For a local business that means the boring facts deserve the labels first: name, address, phone, hours, services, service area. Adding the code guarantees no particular display, since engines decide what to show, but it does guarantee your facts are stated once, plainly, in a form nothing has to interpret. That is the same groundwork behind showing up correctly when someone asks a machine instead of typing a search. If you want the basic block for a local business without writing code yourself, our local schema generator builds one from your details.
The shared vocabulary has a name, schema.org, and on most sites the labels travel as a block of code called JSON-LD that sits in the page's head. You will rarely meet either word unless someone is working on your site, but between them they are what people mean when they say schema or markup.
The displays that can come out the other side are rich results, listings that carry more than a title and a line of text. Two labels a local business hears about most are FAQ schema, which marks a question and its answer as a question and its answer, and review schema, which marks a rating as a rating. Engines set their own rules about which of these they will show, and those rules change, so the labels are worth adding for the accuracy rather than for a look you were promised in the results.
Wrong labels are worse than none. Marking up a rating nobody left, or hours that contradict the hours printed on the page, hands a machine a confident fact that happens to be false. The test never changes: label what is actually on the page.
Ask whoever built it, or paste a page address into one of the free validators the search engines publish. It will list the labels it found on that page, or tell you it found none, which is the common answer for sites put together without anyone thinking about it. Either result is worth having, because a wrong label is quieter and more troublesome than a missing one.
Not directly. It does not push a page up the list. What it changes is how confidently software can state your facts, which affects how your listing is able to look and whether a machine repeats your real hours instead of its best guess at them. That is a different lever than ranking, and one you pull once rather than every month.
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