Port
Computers have digital ports – literally, like for a boat – for other computers to connect to over a network. Ports map to specific things that an operating system might be doing, and there are some standard ones: port 22 is where you log into via SSH, port 80 is HTTP, port 443 is HTTPS (HTTP, but secure), port 53 is DNS, and so on and so forth.

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What's an IP address?
Houses have street addresses, and computers have IP addresses.
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