IRC - Internet Relay Chat
IRC is a low-bandwidth method of communication. IRC is very similar to text messaging, but designed around communicating with large groups of users instead of one on one. People familiar with discord can consider it to be the predecessr of discord and many other similar messaging applications.
IRC has different networks of servers, to which a client may connect to. The
different networks hosts different channels in them.
Channel names usually start with a # sign
Each user on irc is identified by a nick or a nickname. A user may have
multiple nicknames associated to him, to prevent conflicts on different
channels.
Weechat
Weechat is an irc client that is extremely customisable. And since its termial app, it can be put in a tmux session, even on servers. Irssi is also a good alternative but I liked weechat a bit better
Now, weechat does support mouse mode, and its nice to have enabled. but in some cases you just want to use the keyboard. But keyboard shortcuts are easy to forget if you take a break from using them.