This document discusses organizing teams for fast product development. It introduces the concepts of team topologies, which are the fundamental types of teams needed to build software. The main topologies are stream-aligned teams, platform teams, and facilitating teams. It also discusses the core interaction modes between teams: collaboration, X-as-a-service, and facilitating. Managing cognitive load and treating platforms as products are identified as keys to success. Stream-aligned teams focus on a single product stream while platform teams create shared tools and services to reduce cognitive load across many teams.