What is the purpose of the `debug` component in Symfony, especially concerning exceptions?

The `debug` component in Symfony is primarily used for development environments to provide detailed information about errors and exceptions. When a `FatalErrorException` or any other exception occurs in debug mode, this component helps to display a rich error page showing the stack trace, the code context where the error happened, variable dumps, and available services. This significantly aids developers in pinpointing and resolving issues quickly.