The main function is the entry point of the app. It calls the runApp function with an instance of MyApp as the argument. This function takes the given widget and makes it the root of the app, which means it will be displayed on the screen when the app is launched.

The MyApp widget is a StatelessWidget, which means it doesn’t have any internal state that can change. It has a single build method that returns a widget tree. This tree describes the user interface of the app and how it should look.

The MaterialApp widget is a top-level widget that configures the app’s title, theme, and home page. The home property specifies the default route for the app, which is the SignUpForm widget, in this case.

We use the Form widget to build our sign-up page. Under this form widget, we use the TextFormField widget to take user input such as name, email, etc. In the end, we create a sign-up button to implement our sign-in functionality.

Note: Please go through the comments in the code for a better understanding.