In this foundational lesson, we kick off the course by exploring what BGP is and why it’s such a critical part of the networking world. You’ll discover how BGP differs from traditional interior routing protocols like OSPF and EIGRP, and learn about its unique role as the Internet’s de facto exterior gateway protocol. We’ll walk through the structure of the Internet, the concept of Autonomous Systems (ASes), and how BGP routes traffic between them using attributes like AS Path. Along the way, you’ll gain a clear understanding of BGP’s policy-based approach to routing, and why it’s not about speed, but about control, contracts, and connectivity. Whether you’re new to BGP or have struggled with it in the past, this lesson sets the stage for learning it in a clear, simple, and structured way, just as I wish it had been taught to me.