The CDK Explorer, a new preview feature in the AWS Toolkit for Visual Studio Code, allows developers to visualize CDK applications. AWS CDK, launched GA in July this year, is an open source software development framework to model and provision your cloud application resources using familiar programming languages. CDK apps are composed of building blocks known as Constructs, which include definitions for your cloud stacks and resources within. Check out the CDK developer guide or the CDK Workshop to learn more about the CDK.
Source:: Amazon AWS