OpenFlow is a communication protocol that enables the management of network devices, such as switches and routers, in a more flexible and efficient way. It allows network administrators to control the flow of data through the network by defining rules and policies, which can be adjusted dynamically. This capability is essential for modern networks that require quick responses to changing conditions. By separating the control plane from the data plane, OpenFlow supports the concept of Software-Defined Networking (SDN). This separation allows for centralized management of network resources, making it easier to implement new services and optimize performance. As a result, OpenFlow plays a crucial role in the evolution of network architecture.