CQRS stands for _Command-Query Segregation Principle_. Greg Young described (and named) the pattern thoroughly in 2010, but the idea existed way before that time
We are going a little beyond the very basics of Event Sourcing and will start implementing an application that uses the CQRS pattern. During the webinar, Alexey will introduce the CQRS concept and will demonstrate why CQRS is important in event-sourced systems. There will be a great deal of live coding again, demonstrating all the moving parts of both command and query sides in a real-life, although simplistic, application with a domain model.