The internet is a series of connected computers that communicate using requests.
Your computer uses a WEB-BROWSER (Firefox, Edge, Chrome, etc.) to "render" web pages from code to something you (end-user) can see on their screen.
HTML, CSS & JavaScript are programming languages.
Web-Servers
Computers that host websites
Can be real, virtual or other
Run server software
Host databases and other services (Wikipedia/Dropbox)