This document provides an overview of Spring Cloud Gateway, a new API gateway solution developed by Pivotal. It discusses what an API gateway is and its responsibilities like routing, resiliency, security and monitoring. It then covers different types of gateway solutions before focusing on Spring Cloud Gateway, describing how it is built on top of Spring 5, Project Reactor and Spring Boot 2 using a reactive and non-blocking approach. Key features of Spring Cloud Gateway like route configuration, predicates, filters and filter factories are also summarized.