Why would you run functions in the cloud? How do you build an event-driven back end for your applications? Is a single back end enough for all the clients you want to support, such as those using web and mobile? And how can you call Lambda functions from a client?
In this first part of the book, you’ll learn how to use the foundation services—AWS Lambda and the Amazon API Gateway—that you’ll use later to build more complex applications. You’ll also see how multiple functions can be used together to build a single application, such as a back end for a web or mobile app. As you’ll see, this book is a mix of practice and theory.