Search Engines are built on a series of ever-changing and opaque algorithms. Those algorithms have become increasingly complex with advancements in Machine Learning, but none of it is magic. The SEO industry is informal and lacks the rigor required to effectively train its community in the technical aspects of what happens after you click the magnifying glass button. That lack of rigor and understanding has yielded a community full of confusion and misinformation, but it does not have to be that way.The “Science of SEO” is an approachable guide to navigating the confluence of Information Retrieval, Web Development, Data Science and Artificial Intelligence in Search Engine Optimization. This book is being written in response to the explosion of SEO interest in data science and the technical concepts behind search engines with the goal of creating the definitive resource to formalize the concept of SEO engineering.