The presentation discusses body area networks (BANs), which are wireless networks of wearable devices that communicate data about the human body. BANs include sensors that can monitor vital signs and actuators that provide feedback or treatment. Common applications of BANs in healthcare include monitoring heart function, diabetes, and movement disorders. The presentation covers the hardware and software architecture of BANs, challenges around security and privacy, and the potential for BANs to improve healthcare through continuous remote patient monitoring.