What is it?
From Wikipedia: Internet Relay Chat (IRC) is a form of real-time Internet text messaging (chat) or synchronous conferencing. It is mainly designed for group communication in discussion forums, called channels, but also allows one-to-one communication via private message as well as chat and data transfers via Direct Client-to-Client.
#corona on irc.freenode.net
Anytime you feel like it! One of the best things about IRC is being able to idle in a channel and only getting notified when something relevant happens in it (such as someone joining, chatting, leaving, etc).
There are two options:
1) You can use the following link to open the IRC channel in your browser:
2) You can install an IRC client – luckily most of them are completely free! Some examples:
ChatZilla (add-on for Firefox browser): https://addons.mozilla.org/en-US/firefox/addon/16/
Colloguy (standalone IRC client): http://colloquy.info/
MacIrssi (standalone IRC client): http://www.sysctl.co.uk/#macirssi