This document provides an overview of the data streaming ecosystem at Booking.com. It discusses how Booking.com uses Apache Kafka, Kafka Connect, and related tools across over 300 clusters containing over 350 brokers to handle large volumes of streaming data from its various services and applications. Key aspects of Booking.com's data streaming infrastructure are highlighted, including its use of multiple data centers, global and local clusters, monitoring and alerting systems, and operational best practices.