In JIT compilation, the application compiles inside the browser during runtime. Whereas in the AOT compilation, the application compiles during the build time.
Done using ng-serve
All the ng-if and ng-for etc are compiled when the page is loaded
The files downloaded on the browser during JIT is higher because the JIT compiler itself is downloaded into the browser
The advantages of using AOT compilation are:
Since the application compiles before running inside the browser, the browser loads the executable code and renders the application immediately, which leads to faster rendering.
In AOT compilation, the compiler sends the external HTML and CSS files along with the application, eliminating separate AJAX requests for those source files, which leads to fewer ajax requests.
Developers can detect and handle errors during the building phase, which helps in minimizing errors.
The AOT compiler adds HTML and templates into the JS files before they run inside the browser.
Due to this, there are no extra HTML files to be read, which provide better security to the application.