Netlify is a cloud computing company that offers hosting and serverless backend services for static websites (Wikipedia)
You can link your git (github/gitlab/…) repo with your Netlify account and deploy your static site into it in a similar way of Github/Gitlab Pages but with the add you can use some out of the box backend features as:
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forms: if your static content has a form you can receive an email when some user fill it
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aws function: you can define AWS lambda functions and execute it when the user relaizes some action with your content
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Basic auth and OAuth providers