Each server can be either: a web server, app server, database server or load balancer (see details in the above tab)
Server Types
Application servers include everything you need to deploy a PHP / Laravel application, including a cache (Redis / Memcached) and a database.
Web servers include the web server software you need to deploy your application, but do not include a cache or database. These servers are meant to be networked to dedicated cache or database servers.
Worker servers install PHP, but do not install a web server or database. These servers are meant to serve as dedicated queue worker servers that are networked to your web servers.