Didcord is just a tool where you can talk to others, or just use written chat if you prefer. It is more focused around gaming instead of work though. And it is free.
It also isn’t based around schedules or anything, you just go into a room whenever you feel like it and can interact with the other folks in the same room.
For online gaming, you would typically be in a room with the people your playing with and use the voice chat, so that nobody gets distracted from the game by typing or reading.
As hinted in the OP, the Discord rooms can be moderated, so the specifics of what is going on on a given server differs.