Understanding common network ports is essential for troubleshooting and securing your systems. Ports act as communication endpoints for different services. Some of the most commonly used ports include HTTP (80), HTTPS (443), FTP (21), SSH (22), and SMTP (25). Knowing which ports are open or closed helps prevent unauthorized access and ensures smooth connectivity. Tools like Theportchecker make it easy to check port status quickly, helping both beginners and professionals verify their network setup. Regularly monitoring these ports enhances security and keeps your devices running efficiently.