Angular bootstrapping is nothing but allowing developers to initialize or start the Angular application. Angular supports two types of bootstrapping:

• Manual bootstrapping
• Automatic bootstrapping

Manual bootstrapping: Manual bootstrapping provides more control to developers and facilitates them regarding how and when they need to initialize the Angular app. It is useful when professionals wish to perform other tasks and operations before Angular compiles the page.

Automatic bootstrapping: As the name specifies, automatic bootstrapping is started automatically to start the Angular app. The developers need to add the ng-app directive to the application's root if they want Angular to bootstrap the application automatically. Angular loads the associated module once it finds the ng-app directive and, further, compiles the DOM.