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AWS Lambda lets you quickly and easily build and run applications on the AWS cloud that automatically run code in response to events. AWS Lambda makes back-end tasks like producing a thumbnail from a new image or processing requests from a mobile app simple to implement, ready for web-scale traffic, and free of the overhead of managing scalability and availability. With AWS Lambda, every interaction between resources is the potential source of an event that can be processed in near real-time by a function hosted by Lambda. This event-driven approach in the back end of your application lets you focus on developing unique features, freeing you from management of infrastructure. With AWS Lambda, the scope of your application is naturally divided in small functions, giving you a reactive architecture and the right approach to adopt microservices.AWS Lambda in Action is an example-driven tutorial that teaches you how to build applications that use an event-driven approach on the back end.