In today's digital landscape, distributed systems are the backbone of scalable and reliable applications, powering everything from e-commerce giants to real-time streaming services. This book, Building Distributed Systems, provides a practical and accessible guide to understanding and constructing these complex architectures, bridging the gap between foundational theory and real-world application.In this book, we will dive into the fundamentals of distributed systems, understand how computing evolved and what are some critical aspects of these systems that software architects and engineers must always be aware of to help them make design and implementation decisions. Furthermore, we will learn to make tradeoff decisions grounded on key objectives that our systems should focus on versus what may not be so important for each specific use case.By the end of this book, you will possess a strong understanding of distributed systems and be equipped to design, build, and deploy scalable and reliable applications. You will gain practical insights into modern architectures, enabling you to confidently tackle the challenges of building and maintaining distributed systems in any environment.