Glossary

Plain-English definitions for the terms behind these tools.

Link unfurl

The preview card a chat app or social platform builds when you paste a URL — driven by your Open Graph and Twitter tags.

The Open Graph tag that sets the preview image for your link — the picture in the Slack, iMessage or X card.

A meta-tag protocol that controls how your link looks when shared — the title, description and image in the preview card.

The Twitter Card type that shows a full-width preview image above the title — the format most links want.

X/Twitter's own preview format, controlled by twitter: meta tags, layered on top of Open Graph.