H.323 is a standard that facilitates audio, video, and data communication over packet-switched networks, such as the Internet. It was developed by the International Telecommunication Union (ITU) to enable real-time communication, making it essential for applications like video conferencing and VoIP (Voice over Internet Protocol). The H.323 standard defines protocols for establishing and controlling multimedia communication sessions. It includes components like terminals, gateways, and multipoint control units (MCUs) to manage connections and ensure quality. By standardizing these processes, H.323 allows different systems and devices to communicate effectively, promoting interoperability in multimedia communications.