Bubble is a no-code tool that allows users to build software applications without writing any code. The platform provides a visual design tool, pre-built database, and workflows to create a functional application. With Bubble, users can build an Amazon clone by creating a marketplace with features such as product listings, search functionality, and checkout process. The guide outlines the steps to build these features, including setting up the database, creating workflows, and integrating payment processing through Stripe. Once built, the application can be launched on its own custom domain for a low monthly fee of $25, making it an accessible option for individuals or small businesses to create their own marketplace without significant development costs.