TL;DR: JavaScript rendered on the server AND the client. In a nutshell, you are rendering your application markup on the server & piping it down as the complete html to the browser.
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How to Implement Node + React Isomorphic JavaScript & Why it Matters
TL;DR: JavaScript rendered on the server AND the client. In a nutshell, you are rendering your application markup on the server & piping it down as the complete html to the browser.
Full article