Software-Defined Networking (SDN) is an approach to computer networking that allows network administrators to manage network services through abstraction of lower-level functionality. It separates the control plane, which makes decisions about where traffic is sent, from the data plane, which forwards traffic to its destination. This separation enables more flexible and efficient network management. With SDN, networks can be easily programmed and adjusted to meet changing demands. This technology allows for centralized control, making it simpler to implement policies, optimize performance, and enhance security across the entire network infrastructure.