CUBIC
Linux default TCP congestion control since 2006. Uses cubic function for window growth — faster recovery after loss on high-speed networks.
Sangtae Ha + Injong Rhee 2008. Default on Linux, also iOS + Android are based on CUBIC. Differs from older Reno: window growth based on time since last packet loss, not ACK rate. On short RTT links similar to Reno; on long RTT links gives much better throughput. Competitors: BBR (Google), Reno (classic).