Do you want to know how your phone can send and receive information without any wires? Ever wondered why your connection gets slower when you move further away from WiFi — or when you're in a crowded room? Curious about how WiFi has improved over the years, and what’s coming next? In this course, we’ll explore how WiFi really works. We’ll cover the basics of digital modulation and encoding, looking at them through the lens of WiFi’s 802.11 physical layer. We’ll also dive into Media Access Control, focusing on 802.11’s CSMA/CA protocol. Along the way, we’ll connect these ideas to the bigger picture with a quick look at the OSI model and why each layer matters.