Prebuilds in Daytona are pre-configured workspace environments that significantly reduce the time it takes to start a new workspace by having most of the setup work done in advance. They accelerate development by pre-building your Workspace, ensuring it starts almost instantly. Prebuilds work by registering a listener for webhook events from the Git repository and can be automatically initiated based on repository events. Key features of prebuilds include automatic triggers, customizable configurations, build retention, and prebuild status monitoring. To set up prebuilds, you must first set up a project configuration, which defines and manages projects within a Workspace, storing information like repository URL, build configuration, and environment variables. Once the project configuration is set up, you can add a new prebuild by running the command `1daytona prebuilds add`, which will prompt you to select a project configuration, enter several configuration options, such as commit interval, trigger files, retention, and whether to run the build once submit. Prebuilds offer several benefits, including faster startup times, improved productivity, consistent environments, and resource efficiency. With prebuilds, you can streamline workspace creation, boost development efficiency, and optimize resource usage by having environments ready when you need them.