Due to the demands of big data, cloud computing, Internet-of-Things (IoT) and mobile devices, new architectures for computer networks have evolved: Software Defined Networking (SDN) decouples the data plane (packet forwarding, on commodity hardware) from the control plane (control functions, on high performance servers) and offers open programming interfaces. Network Functions Virtualization (NFV) extends existing concepts for server and network virtualization. This allows network functions (like, e.g., routing) that have traditionally been executed on proprietary hardware to be virtualized and executed on commercial off-the-shelf hardware. This lecture offers an introduction to these new technologies, concepts and standards and provides insight into their application in data centers, for fog and cloud computing and for IoT applications.