Google can present a summary of your page as a card shown to users in Discover, which is a scrollable list of topics that users can browse on their mobile devices. Tapping a card will send the user to the page that is the source of the Discover entry.
Discover shows users a mix of content based on their interactions with Google products or content that they choose to follow directly. And we're not limited to what's published today — if we think that a user would find earlier content interesting, then Discover will show it.
Discover also features videos, sports scores, entertainment updates (such as a new movie release), stock prices, event information (such as the nominees for a major award ceremony, or the lineup of an upcoming music festival), and more. Discover is a content hub for all of your interests.
Optimize your content for Discover
Discover content is algorithmically ranked by what Google thinks a user would find most interesting. Content ranking is powered by the strength of the match between an article's content and a user's interests, so there aren't any methods for boosting the ranking of your pages other than posting content that you think users will find interesting.
Your pages are eligible to appear in Discover cards simply if they are indexed by Google and meet Google News content policies. No special tags or structured data are required. Google ranks Discover content algorithmically based on content quality and the strength of the match between page content and user interests.
The two best ways to boost the ranking and performance of your Discover content are (1) to post content that you think users would find interesting and (2) to use high-quality images in your content. Publishers experience a 5% increase in clickthrough rate, a 3% increase in time spent on their pages, and a 3% increase in user satisfaction when Discover cards feature large images instead of thumbnail images.
To enable large images in your Discover results: