1.Introduction 2.How to navigate this book 3.The mainframe defined 4.Mainframe hardware 5.Mainframe operating systems 6.z/OS – the mainframe flagship operating system 7.Middleware for z/OS 8.Programming languages for z/OS 9.Integration technologies for z/OS 10.Linux for the mainframe 11.Application development for z/OS 12.Security on z/OS 13.System management for z/OS 14.Modern mainframe application architectures 15.Understanding mainframe cost 16.Mainframes in the cloud era 17.Transformation strategies 18.The future of mainframe computingThe missing mainframe introduction for IT leaders and professionals. Clear, vendor-neutral guidance on mainframe technology, modernization and integration. For CIOs, architects and IT professionals.The missing introduction to mainframe computing for modern IT leaders and professionals.Mainframes process 70% of the world's transactions and deliver 99.999% uptime. Yet most IT executives have never received a proper introduction to this critical infrastructure.Instead, you get myths, jargon, and vendor pitches. When decisions arise—invest? modernize? migrate? integrate?—you lack the fundamental understanding to evaluate options intelligently.This book fixes that.Written for IT leaders and professionals who need to understand mainframes without becoming specialists, this provides the missing foundation: clear, vendor-neutral guidance on what mainframes are, how they work, and how they integrate with modern applications and cloud platforms.What you'll learn:•Understanding the platform – What makes mainframes different? Modern capabilities like AI, containers, and DevOps. How integration with cloud-native applications actually works.•Evaluating options – Modernize, migrate, integrate, or hybrid approach? Each has trade-offs. This book helps you evaluate based on business value.•Managing effectively – How costs work. How to build talent pipelines. How cloud strategy and application integration apply.What makes this different:Vendor-neutral. Business-focused, not just technical. Covers current technology: AI accelerators, quantum-safe encryption, containerization, REST APIs, and integration patterns.Who this is for:CIOs, IT executives, enterprise architects, IT professionals, CFOs, and consultants. You don't need mainframe experience—this is the introduction you never received.The platform isn't the problem. The knowledge gap is.This book closes that gap. Then you can decide.The missing introduction to mainframe computing for modern IT leaders and professionals.Mainframes process 70% of the world's transactions and deliver 99.999% uptime. Yet most IT executives have never received a proper introduction to this critical infrastructure.Instead, you get myths, jargon, and vendor pitches. When decisions arise—invest? modernize? migrate? integrate?—you lack the fundamental understanding to evaluate options intelligently.This book fixes that.Written for IT leaders and professionals who need to understand mainframes without becoming specialists, this provides the missing foundation: clear, vendor-neutral guidance on what mainframes are, how they work, and how they integrate with modern applications and cloud platforms.What you'll learn:•Understanding the platform – What makes mainframes different? Modern capabilities like AI, containers, and DevOps. How integration with cloud-native applications actually works.•Evaluating options – Modernize, migrate, integrate, or hybrid approach? Each has trade-offs. This book helps you evaluate based on business value.•Managing effectively – How costs work. How to build talent pipelines. How cloud strategy and application integration apply.What makes this different:Vendor-neutral. Business-focused, not just technical. Covers current technology: AI accelerators, quantum-safe encryption, containerization, REST APIs, and integration patterns.Who this is for:CIOs, IT executives, enterprise architects, IT professionals, CFOs, and consultants. You don't need mainframe experience—this is the introduction you never received.The platform isn't the problem. The knowledge gap is.This book closes that gap. Then you can decide.