When you have built your website, you will want to export it.
To make it so other people can see it, you will need a web server or web host.
A web server is a server where your website sits. Web servers are usually part of normal servers, such as a VPS or Dedicated server. A web server is your responsibility to maintain including installing appropriate packages.
A web host is a web server that is managed by a different company. It is usually classed as a web hosting package. It means all you have to do is upload your content and you're ready to go.
Uploading is most commonly done through either FTP or SFTP. there are lots of clients out there to achieve this and giving specs on each is a little beyond the purpose of this documentation.
Sunrise Waterfall does come built in with a basic FTP client, see the above sections.
Built with thanks using Sunrise Waterfall by Nathan Tech.