Replit Autoscale Deployments` allows developers to launch `Bun apps` that automatically scale from zero to meet customer demand, combining the speed of `Bun` with the power of `Replit infrastructure`. Building a Bun app is as simple as `forking the official template`, creating a new project, and then deploying it to `Replit Autoscale Deployments` in under a minute. `Bun` is an all-in-one JavaScript runtime that offers a faster alternative to `Node.js`, with highly optimized APIs and a complete toolkit, making it a direct replacement for Node.js.