This chapter defines the data connectivity provided by the Fifth Generation System (5GS) (Protocol Data Unit [PDU] Sessions, PDU Session continuity modes, traffic offloading, etc.). It then describes 5GS Quality of Service (QoS) framework (QoS Flows, parameters of the 5GS QoS, Reflective QoS, etc.). Finally, it gives an overview of session management including an overview on how applications can influence traffic routing and policy control for PDU Sessions.