A meta description is a short snippet of text, usually around 150 to 160 characters, that summarises a web page and often appears beneath the page's title in search results, acting as the page's pitch to a searcher.
It is the advertising copy for an organic listing. The meta description does not directly move rankings, but it heavily influences whether someone clicks your result or a competitor's, which decides whether the ranking is worth anything.
It is a chance to qualify the visitor. A clear description that states what the business does and where can pull in the right clicks and quietly filter out the wrong ones.
Left blank, Google writes its own. The auto-generated version is often a clumsy sentence fragment from the page, when a deliberate description would have done a far better job of earning the click.
Two plumbers rank next to each other. One has no meta description, so Google shows a random fragment of page text. The other has a written description: emergency and general plumbing across the named suburbs, same-day call-outs, fully licensed.
A searcher scanning the results sees one vague listing and one that clearly answers what they need.
Same ranking position, but the plumber with the deliberate description earns more of the clicks, which is the entire point of ranking there.
In-House writes and maintains meta descriptions across the site through the SEO agent, treating each one as the listing's pitch rather than an afterthought.