Read the Docs has been committed to improving the accessibility and user experience of Sphinx since the start, and that includes the markup language in which the documentation is written. Years ago, after carefully listening to users, we announced recommonmark to help bridging the immense popularity of Markdown with the powerful capabilities of Sphinx. (It is now deprecated in favor of MyST - keep reading to know more.)

It is no surprise that Markdown is in such demand: thanks in large part to the huge popularity of GitHub, Markdown is nowadays the most widely used markup language in open-source projects, ahead of reStructuredText, the second in the list, by an order of magnitude.