What is a meta description?
A meta description is a sentence or two about a page, placed in a meta tag in the page's head and invisible on the page itself. Its purpose is to tell a searcher what they will find if they click. Google and the other engines often show it as the gray text under a result's blue title, which makes it the closest thing a page has to an ad in organic search. It is not a ranking factor, and it has not been one for many years, but it has a direct effect on whether people choose your result over the one above it.
The convention is roughly 150 to 160 characters, because that is about what fits on a desktop result before the text is cut off; mobile shows less. Search engines treat the description as a suggestion. If they think a different passage from the page answers the query better, they will show that instead, which happens more often than most site owners realize.
Why it matters
Why a meta description matters
Ranking gets a page onto the results page; the description gets it clicked. Two results in the same position with the same title can differ by a third or more in click-through rate because one description tells the searcher exactly what they will get and the other is a truncated first sentence. For a page that ranks well, the description is the cheapest improvement available: a few words, no development, and a measurable lift in traffic within weeks.
It is also a brand moment. The results page is the first place many people meet a company, and a description written in the brand's voice, with a clear promise and a reason to click, does the brand's work before the site has loaded. A description that is missing, duplicated across every page or stuffed with keywords tells the same person that nobody is minding the store.
In practice
How a meta description works in practice
- 01
The description is set in the page's HTML or, more often, in a field in the content management system or an SEO plugin. The craft is in the writing. A good description names what the page is about in words the searcher used, states what makes it worth reading and, where it fits, ends with a reason to act. It is specific to the page: a product page describes the product, a glossary page defines the term, an article says what it argues. It avoids repeating the title, because the title is already on the screen.
- 02
The process for an existing site is an audit. Pull every page, find the ones with missing, duplicated or truncated descriptions, prioritize the pages that already rank and get impressions, and rewrite those first. Then watch click-through rate in the search console and iterate. Descriptions are one of the few parts of SEO where a change on Monday can be measured by the following month, which makes them a good first project for a team that is new to the discipline and wants a visible win.
Watch out
What people get wrong about meta descriptions
Stuffing them with keywords. The description does not affect ranking, so a list of search terms gains nothing and costs the click, because it reads like spam. The second mistake is leaving them blank or letting the CMS generate them from the first sentence of the page, which usually produces an opening that was written to be read in context, not as a promise in a results list.
The third is writing one description and copying it everywhere. Duplicate descriptions are flagged by every SEO tool for a reason: they tell the engine the pages are interchangeable and tell the searcher nothing. The fourth is assuming the engine will show what you wrote. It often will not, so the page itself should also contain a clear, early passage that answers the query, because that passage is what will appear when the description is replaced.
