Vapor is a popular Swift web framework that allows developers to quickly build web applications using Swift. To get started with Vapor, users need to have Swift 3 and the Swift Package Manager installed on their system. The framework provides a command-line interface that simplifies tasks such as building, running, and deploying web apps. A Droplet is the core component of Vapor, which creates routes using the Router. The framework uses Leaf templating language for rendering views. Users can define custom routes and views to render dynamic content. Additionally, Vapor has built-in support for working with JSON data, making it suitable for building APIs and web applications.