After HTML, CSS, and JavaScript, WebAssembly is the fourth official language of the web. WebAssembly is at an inflection point. Over the next few years, I expect to see increased adoption of WebAssembly across the tech sphere, from containerization to plugin systems to serverless computing platforms. The following is a discussion of what WebAssembly is, what makes it a relevant technology, and where it’s being used today. I’ll also describe some potentially high-impact applications and make some predictions about its future.