Virtualization is a technology that allows you to create multiple simulated environments or dedicated resources from a single, physical hardware system, while Virtual Machines are software emulations of physical computers. Coursera's catalogue on Virtualization and Virtual Machines helps you understand and implement these technologies to maximize resource utilization and increase operational efficiency. You'll learn about the principles of virtualization, types of virtual machines, their architecture and management, and how to implement virtualization using platforms like VMware or VirtualBox. Additionally, you'll learn about topics like server consolidation, disaster recovery, testing and development, and cloud computing - all integral components of modern IT infrastructure.