A meta description is a snippet of text stored in your page's HTML <head> section that describes what the page is about. Search engines like Google display it below your page title in results, giving users a preview before they click. The optimal length is 150–160 characters; anything longer gets truncated with an ellipsis on desktop and mobile. Meta descriptions don't carry direct ranking weight in Google's algorithm—John Mueller confirmed this multiple times. Their real value is persuasion. A well-written description that matches search intent can lift your click-through rate by 20–40% compared to a generic or missing one. Higher CTR signals relevance to Google, which can indirectly improve rankings over time. Google doesn't always use your meta description. If it decides your written description doesn't match the query, it pulls text from the page body instead. This happens in roughly 30–40% of searches, especially for long-tail or unexpected queries. That's why on-page copy quality still matters even if you write perfect meta tags. At Ottawa SEO, we treat meta descriptions as micro-ad copy. We front-load the primary keyword naturally, include a benefit or answer, and add a soft call-to-action when space allows. For local pages targeting Ottawa or Toronto, we mention the city name early. For ecommerce or service pages, we highlight differentiators like pricing, turnaround, or guarantees. Common mistakes: keyword stuffing (looks spammy and Google may ignore it), duplicating the H1 verbatim (wastes the opportunity to add context), or leaving it blank (Google writes one for you, usually poorly). Also avoid special characters that break in SERPs—stick to standard punctuation. Every page should have a unique meta description. Duplicate descriptions across dozens of pages dilute their effectiveness and make your site look low-effort in search results. If you're managing hundreds of product or location pages, templated descriptions with dynamic insertion of product name or city work better than nothing, but custom ones always outperform when CTR matters.