Database on Github Pages

I want to ask that can i use any kind of database to store some information of a contact page in GitHub pages because GitHub pages only allow static content, I have read that Firebase can be used for this purpose on stack overflow, Thanks for reading !

GitHub Pages only allows static pages because they are simple to host and everything will be run on the clientside.
You can use browser APIs like IndexedDB or localStorage.

Similar services like Vercel or Netlify offers serverless functions which can be used to Establishment DB connections.
But they also don’t host a database, because this is not trivial.