They Talk On Discord, Here's How It Works
Now I’m going to teach you kid terminology. You are going to understand how they communicate with each other. This almost feels like you are understanding a 5ft tall alien species.
First of all kids need a headset with a microphone, it acts just like a phone and they don't have to pay for credit (A headset is just headphones with a mic).
And second of all they need a program that they can all jump on and talk to each other. The main program everyone uses nowadays is called “Discord”. You may have heard your child tell their friends: “hey get on disc”. Disc is short for Discord.
When they hop on discord they hop on one of the servers that they use, then they jump in a channel.
They can only voice chat with people in the same channel. Usually channels are filled with 3 or 4 of their friends.
Only the people on the same Discord server can access those channels. So if your child is talking on the computer, you can ask what kind of Discord server they are on. Most of the time they will answer a friend's server. Which means it's a small server with friends of friends and that's it.
If you want to speak with your child and they are in the middle of a game talking, you can ask them to “deafen”. It means mute all voice chat so they can listen to you talk for a minute.
They will probably be shocked that you understand their language.
Pro tip: ask your son if you can put on his headset for a few minutes and just listen. This will give you a greater understanding of the types of people they are talking to.