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A port is a numbered channel on a server that a specific service listens on, letting one IP address host many different services simultaneously.
The Office Building Analogy
If an IP address is a building's street address, a port is a specific suite number — mail (data) needs both to reach the right destination inside.
Common Ports You'll See
Port 80 handles standard HTTP traffic, 443 handles HTTPS, 21 handles FTP, and 22 handles SSH — each service has its own conventional port.
Why It Matters
Firewall rules and hosting troubleshooting often reference specific ports — understanding this helps you make sense of error messages and security configurations.
