What's the difference between `requests.exceptions.RequestException` and its subclasses?

`requests.exceptions.RequestException` is the base class for all exceptions raised by the `requests` library. Its subclasses include `ConnectionError`, `HTTPError`, `Timeout`, `TooManyRedirects`, and `URLRequired`. Each subclass represents a specific type of error and allows you to handle them differently. For example, you can retry `ConnectionError` but not `HTTPError`.