In this chapter, key elements of 5G/5G-Advanced are reviewed with particular emphasis on enhanced mobile broadband (eMBB) as this is the feature that most impacts smartphone communication. First, the main architecture options for connection to the core network are reviewed followed by the Radio Access Network (RAN) protocol architecture. The RAN is responsible for all radio-related functions such as coding, modulation, HARQ operation, physical transmission, and scheduling. Following this, study within the RAN is narrowed to the physical layer as specified in 3GPP Release 15, the first 5G release, with emphasis on how the user data physical channels are structured. How maximum user data rates and low latency are achieved is demonstrated, 5G operating frequency spectrum reviewed, and some typical base station and UE parameters presented. Next, we address certain key features introduced in Release 16, Release 17, and Release 18 (5G-Advanced).