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Exceptions are events that occur during the execution of a program when an error or other unexpected event occurs. Exceptions help handle errors gracefully, making it easier for the user and developer to understand the problem.

In Python, you can catch exceptions by using the keywords "try" and "except". The "try" block contains the code that may raise an exception, while the "except" block contains the code that will be executed when an exception occurs. If no exception occurs during the execution of the "try" block, the code in the "except" block will be skipped.

To retrieve an error message from an exception, you should catch the exception using the "except" keyword followed by the exception type and an alias. For example, you can catch a specific exception such as "ZeroDivisionError" and assign it to the alias "e". Then you can use the 'str()' function to convert the exception object into a string to retrieve the error message. Let's see this in action with an example: ```python try: result = 10 / 0 except ZeroDivisionError as e: error_message = str(e) print(f"An error occurred: {error_message}") ``` In this example, we are trying to divide 10 by 0, which will cause a "ZeroDivisionError" exception. We catch the exception using the "except" block and store the exception in the variable "e". We then convert "e" into a string using the 'str()' function to retrieve the error message and print a helpful message for the user.