Do you know what IRC is?
I recall it is an Internet Relay Chat. An application sort of layer protocol that faciiliates communication in the form of text.
You seem to know a lot about it. I chose the topic because I don't know anything about it. 
Yeah it's the chat process that works on a client/server model. It's a network chat. It's very interesting. Do you want to now more?
Yes, please. Why is it not used anymore?
I believe it is still used in discussion forums. It also allows private communication in messages too. It consists of chat, data transfer and file sharing.
That's very interesting. When was it invented?
I'm not quite sure about that, most likely every since forums were created. It's a client software that's available for every operating system supporting Internet access.