This book investigates the technical evolution and design decisions that transformed the Arpanet into the modern global internet. Peter H. Salus, a noted historian of computing, utilizes primary documentation and technical records to trace the development of networking standards. He argues that the internet's current ubiquity is the result of specific, incremental engineering choices made by early researchers and government-funded projects. The text provides a chronological framework that connects early military-funded experiments to the expansive, decentralized network infrastructure used today.

Experts recognize this work as a detailed technical history that prioritizes engineering milestones over general anecdotes. Readers frequently note the academic density of the prose, which serves as a foundational reference for those interested in the origins of modern network architecture.