are the applications that I assign to specific ports also a server ?
I searched a lot but I can not clear answers. If they are not server at the same time are there seperate servers for the different ports. If you can help me, I will be gratefull.
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For example in the above image are there two seperate server that are working ports on 3000 and 4000 or are there only one server and on this server there are two applications and these applications listen specific port? I can not decide.
When you build an app with Express.js and then launch it on a specific port, it opens/uses that specific port to serve the HTTP server. So, yes they are servers.