This document provides an overview of MarTech (Marketing Technology) and various categories within MarTech. It begins with definitions of MarTech and examples of how technology is changing CRM. It then outlines the main MarTech categories including advertising & promotion, commerce & sales, content & experience, data & analytics, and marketing automation. Under each category, various subcategories are described along with case studies of Indian MarTech companies providing solutions within those subcategories. Programmatic advertising, mobile marketing, email marketing, and digital asset management are discussed in more depth with descriptions of key concepts and processes.