This book introduces WebAssembly basics, its purpose, and real-world use cases in web, server, and desktop apps. Featuring examples in languages like AssemblyScript, C/C++, and Rust, it covers converting legacy codebases to WebAssembly for browser compatibility. It showcases advanced use cases like WebAssembly-based music tools, Git integration, and smart contracts. The book concludes with WebAssembly's role in cloud-native Kubernetes, signaling a new era in container orchestration. Many of the examples build on the author's experience with WebAssembly Music, git in WebAssembly, and NEAR protocol smart contracts. These examples serve as real-world use cases, more than just a basic introduction to the technology.