IRC (WikiPedia:Internet_Relay_Chat) is a form of instant communication over the Internet. It is mainly designed for group (many-to-many) communication in discussion forums called channels, but also allows one-to-one communication.
The easiest way to join our chatroom when you are using Puppy is to click on the Chat icon on the desktop or find it in the menu.
If not using Puppy or if you prefer you can also use the freenode webchat.
If you already have an IRC program installed, you might be able go to irc://irc.freenode.net/puppylinux to auto-load your IRC client & our chatroom. If that doesn't work then enter irc.freenode.net as the chat server and #puppylinux as the channel in the appropriate places.
For lots more, see our older IRC chat wiki page.