(OG) tags are <meta> declarations in a page's head that control the link preview when a URL is shared on social networks or messengers. They define things such as the title, description and preview image.
Typical Open Graph tags are:
og:titlefor the preview title,og:descriptionfor the short description,og:imagefor the preview image,og:urlandog:typefor URL and content type.
Open Graph is not a direct ranking or search factor, but it shapes how attractive shared links look and therefore indirectly affects clicks and reach. If the tags are missing, platforms fall back on other signals such as the or , which can lead to uncontrolled previews. OG values should match the visible content and the title and meta description.