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Define AOT and mention its benefits.

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Angular applications contain HTML templates alongside the standard components. Since the browser cannot directly understand these components and HTML templates, Angular apps must be compiled first before you can run them in a browser.

The Angular ahead-of-time (AOT) compiler converts the Angular HTML and TypeScript code into JavaScript code during the build phase before the browser can download and runs the code. By compiling the Angular application in the build stage, you encourage the faster launch of Angular apps in the browser. 

The benefits of using AOT compiler are:

  1. By using AOT, the browser can download a pre-compiled version of the application. The browser downloads executable code so that it can render the Angular application immediately, without waiting for the app to compile first.
  2. Thanks to AOT, the compiler inlines external HTML templates and CSS style sheets within the application JavaScript, thereby eliminating separate AJAX requests for source files.
  3. During the build stage itself, the AOT compiler detects and reports any template binding errors.
  4. Since AOT compiles HTML templates and components into JavaScript files before serving them to clients, there remain no more templates to read and even no risky client-side HTML/JavaScript evaluation. This reduces the possibilities of injection attacks.

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