A core network is the central part of a telecommunications network that connects various access networks and manages data traffic. It is responsible for routing and switching data between different users and services, ensuring efficient communication. The core network typically includes high-capacity routers and switches that handle large volumes of data. In modern networks, the core network supports various technologies, including 4G, 5G, and Internet Protocol (IP). It plays a crucial role in providing services like voice calls, video streaming, and internet access. By managing data flow, the core network helps maintain quality and reliability for users.