Vercel
Vercel is a service that puts your website online for you and updates it whenever your code changes.
In a simple example
You connect your code account, press Deploy, and a few minutes later your site has a real web address.
Why it matters to you
It removes the hard part of hosting, so a beginner can publish a site without owning a server.
Do not confuse with
Vercel is one of several hosting services. The site you build is not tied to it for ever.