[nsonha]

it's an implementation of the micro-frontend idea: https://micro-frontends.org

here is the key page: https://docs.astro.build/en/concepts/islands

[schemescape]

Thank you! I’ve seen Astro referenced and praised many times, gone to the homepage, and clicked around, etc.

That second link is the only one I’ve seen that explains what Astro actually does.