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Safe or Secure? examines the evolution and deployment of age verification systems, situating them within broader technological, regulatory, and societal frameworks. It analyzes this trend as part of the international response to the rapid expansion of the internet and subsequent exposure of minors to online content that was not originally designed with age-based boundaries. Drawing on developments across the globe, the book traces how age verification has progressed from simple offline age checks to cutting-edge solutions embedded within online services and digital platforms. It explores the persistent tension between child protection objectives and the need to safeguard privacy and data rights, a balance that continues to shape regulatory decisions and system design. The discussion covers a range of approaches currently in use or under development, including identity document verification, financial and institutional linkages, and emerging biometric and behavioral techniques such as facial analysis, voice, and electrocardiogram. These developments are examined in relation to their practical deployment, limitations, and implications for governance. The book also covers ongoing debate over where age verification should be implemented across the digital stack—at the device, operating system, app store, or platform level—and how this reflects unresolved questions of responsibility and accountability among different players of the ecosystem. Structured to provide a clear progression from historical foundations to contemporary practice, the book is organized into thematic chapters and is written to remain accessible to readers across disciplines, including policymakers, engineers, researchers, practitioners, as well as broader stakeholders such as activists, educators, parents, and general users engaged in the ongoing discourse on online safety and digital governance.