Adds JSON-LD metadata so web crawlers know what the content of each page is #724
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There's no body text for web crawlers to work with, so metadata is important.
Depending on Google's opaque algorithms, they may display more info about pages with @types they care about, such as WebApplication. JSON-LD also supports linked data, so one can show different websites are run by the same Organization.
Rich results from Google
Also, changes social media previews to use the site-configured app description.