The Basic Rate Interface (BRI) is a type of digital telephone line used in Integrated Services Digital Network (ISDN) systems. It provides two 64 Kbps bearer channels for voice or data transmission and one 16 Kbps signaling channel. This setup allows users to make multiple calls or transmit data simultaneously over a single line. BRI is commonly used in small to medium-sized businesses for its cost-effectiveness and flexibility. It supports various services, including voice calls, video conferencing, and data transfer, making it a versatile choice for communication needs.