The Port Checker Tool is important because it helps you find and fix network problems quickly. Without this tool, it can be very hard to know why a service is not working. You may think your server is down, but in reality, only a port is blocked. For website owners, open ports are critical. If port 80 or 443 is blocked, visitors cannot open the website. A Port Checker Tool helps confirm whether the problem is with hosting, firewall settings, or the internet connection.