Port forwarding is the process of allowing a computer or device on a private network to accept incoming connections from the public internet. This is often done to allow remote access to services running on the private network, such as web servers, file servers, or gaming servers.
To check if a port is forwarded, you can use a port checker tool. There are many free and paid port checker tools available online. Simply enter the IP address of the computer or device you want to check, and the port number you want to test. The tool will then attempt to connect to the port and will let you know if it is open or closed.