Glossary
Open Graph
Open Graph (OG) is a metadata protocol that defines how a webpage previews when shared on social media — title, description, image.
Open Graph (originally a Facebook spec, now adopted across LinkedIn, X/Twitter, Slack, Discord, iMessage, and others) defines a set of <meta> tags that control how your URL renders when shared as a link preview.
Key OG tags: og:title, og:description, og:image (1200×630 recommended), og:url, og:type. Twitter has its own twitter:card tag with similar variants.
Sites without OG metadata render as bare URLs in social shares — drastically reducing click-through rate.
Example
A landing page with a custom 1200×630 OG image, a sharp title, and a one-line description gets ~3× the click-through rate of the same URL with no OG tags.