In this hands-on course, we'll build a pizza ordering web application where the users will be able to select menu items, choose a delivery or pickup option and enter payment details and then order the pizza. The back end and front end of this app will be built using various services provided by AWS. As you can see in this diagram, our architecture is divided into several layers. The data layer consists of Amazon DynamoDB, which is a fast and flexible NoSQL database. It's best suited for applications that require a flexible data model and reliable performance, like our web application here. Then the data access layer is hosted in lambda functions. All necessary transactions to the DynamoDB are made through lambda functions. We'll also utilize Amazon Polly in this application, which is a newer service by Amazon. It lets you convert text to lifelike speech. In our case, we'll use it to convert order status to speech, which will be played back by our application for the users to hear. Each of our lambda functions here corresponds to a microservice that performs a certain task. And we'll orchestrate these using Amazon Step Functions. Hence our business logic layer is embodied in Step Functions where we make decisions based on results from lambda functions. Step Functions will allow us to create a visual workflow or state machine for our execution. Then, our integration layer consists of API Gateway, which will be used to create a rest interface of the underlying daytracks islay for the client task. Here, we'll directly integrate API Gateway with Step Functions. For the front end, we'll create an HTML page using JavaScript and host our page on Amazon S3 as a static website. Okay, if you're ready, let's get started!