AOT compilation is a process that converts Angular components and templates into highly optimized JavaScript code during the build process. This results in a smaller bundle size and faster load times for the application. AOT compilation also detects and reports errors at build time rather than at runtime, which can save time and effort during development.

AOT compilation is useful for several reasons. First, it reduces the size of the application bundle, which can improve the performance of the application. This is especially important for mobile devices and users with slow internet connections. Second, it detects and reports errors at build time rather than at runtime, which can save time and effort during development. Finally, AOT compilation can improve the security of the application by preventing certain types of attacks, such as template injection attacks.

ng build --prod --aot

To use AOT compilation, you can run the following command: ng build --prod --aot. This will build the application with AOT compilation enabled and generate a smaller bundle size. You can also configure your build system to automatically use AOT compilation for production builds. AOT compilation is a best practice for Angular development and should be used whenever possible to improve the performance, security, and maintainability of your application.