You're setting up a Minecraft gaming server so that you and several of your friends can share a realm during your gameplay. To do this, your friends will need to access your server over the Internet, which means you must configure your router to send this traffic to your game server. Which router feature will you use and which port must you open

To get your Minecraft server running online, you will first need to enable port forwarding, to forward the traffic from the internet to the game. Minecraft uses port 25565. Once this port is open, you may also want to use an static IP address, since you will most likely turn off your computer often and the default configuration of your router is to assign a new IP address in every start-up, and you will not want to change the server's IP address each time you want to play the game.

Last but not least, make sure to double-check everything is in place, and then give your friends your external IP address so they can use it to log in to your server!