It's federated real time chat, similar to IRC, with a lot of additional embedded functionality, akin to slack/teams/discord. You can either go to the largest matrix host, matrix.org, or any other website with open registration and make an account and you should have access to join any open channel.
That said, in my experience, most of these communities are closed, but generally happy to invite people from one closed community to another.
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Matrix chat is … interesting. Though beware, the crazy is infectious.
How does one use it? No obvious link to any chatroom
It's federated real time chat, similar to IRC, with a lot of additional embedded functionality, akin to slack/teams/discord. You can either go to the largest matrix host, matrix.org, or any other website with open registration and make an account and you should have access to join any open channel.
That said, in my experience, most of these communities are closed, but generally happy to invite people from one closed community to another.