What internet protocol was documented in RFC 1459?

The internet protocol documented in RFC 1459 is IRC (Internet Relay Chat). IRC is a widely used chat protocol that allows real-time text-based communication over the internet. RFC 1459 specifically outlines the technical specifications and guidelines for the IRC protocol, including its client-server architecture, message formats, and commands. IRC has played a significant role in facilitating online chat communities, allowing users to participate in group discussions, share files, and engage in private conversations.