The Internet has long suffered from the infamous bufferbloat and packet losses, particularly in developing regions in the world. Mobile networks in developing regions are particularly challenging because of dense deployment of traffic policers for limited bandwidth and high RTTs. This talk will introduce the core BBR design and its pragmatic approach to real-world problems like traffic policers. Based on billions of traces collected on Google servers, we redesigned a new congestion control to solve these problems, from the ground up. Unlike many previous controls which rely solely on packet drops or losses, BBR models the network based on observing the packet delivery process, and seeks highest throughput with bounded queue. It is fully deployed on Google and YouTube servers worldwide and available in public Linux kernel and QUIC repository.