I don't even know what that is.
It's the Internet Relay Chat protocol. Essentially, you install a client, connect to a channel, and download files. It's fast, reliable, and I've never heard of anyone being tracked on it. It's an excellent alternative to torrents, especially when it comes to TV shows.
If you're interested, google "mirc" to find out more about a good IRC client. The link gets flagged as spam.