A Private Branch Exchange (PBX) is a telephone system that manages incoming and outgoing calls for a private organization. It connects internal telephones to each other and to external phone lines, allowing users to communicate without needing a direct line to the public telephone network. This system can handle multiple calls simultaneously, improving efficiency and reducing costs. Modern PBX systems can be either traditional or cloud-based. Traditional PBX systems use physical hardware, while cloud-based systems rely on the internet for call management. Both types offer features like voicemail, call forwarding, and conference calling, enhancing communication within organizations.