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A Port Checker is an online or offline tool that checks the status of a network port. It tells you whether a port is open, closed, or filtered. In simple words, it shows whether data can travel through that port or not. Every internet service uses ports. For example, websites usually use port 80 or 443, emails use different ports, and games or apps use their own ports. A Port Checker Tool sends a small request to the port you want to test. If it gets a response, the port is open. If not, the port may be closed or blocked by a firewall. Another important thing is security. Hackers often look for open ports to attack systems. By using a Port Checker Tool, you can see which ports are open and close the ones you do not need. This makes your system safer.