WebAssembly (Wasm) was built for the browser. But like many technologies, it is useful far beyond its intended use. This talk begins by articulating the original goals of WebAssembly. Next, we talk about the evolution of the cloud from virtual machines to containers. This opens the opportunity to talk about how WebAssembly provides the right security and performance profile to join containers and VMs as a third kind of cloud computing. In the end, we will live to code a demo of a serverless function compiled to WebAssembly, showing how much faster and resource-efficient WebAssembly is.