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this post was submitted on 09 Apr 2024
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Asklemmy
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You have servers that provide some kind of resource or service, and clients that use those resources or services (will just say resource from now on).
Servers provide that resource using a port so clients will come ask for it using that port.
Sometimes servers can do multiple things, so they will provide multiple resources...maybe a web server hosting a web page is also an email server that can receive and send email too. They do those things using different ports to distinguish the kind of request it's getting.
On the client side, clients use source ports to distinguish which app asked for a resource. Think of your browser having 20 tabs open, each has it's own source port so your computer never gets confused which page goes to which tab.
I'm skipping a lot of things (ports flipping for replies, well known, etc), but that's the basics.