Which Python keyword is used to define exceptions?

In Python, the keyword used to define exceptions is "raise." This keyword is employed to trigger an exception explicitly at any point in your code. When you raise an exception, you can provide a specific type of exception (like ValueError, TypeError, etc.) and an optional message that describes the error. This allows you to control the flow of your program by managing error conditions effectively.

The other options represent concepts related to handling exceptions but do not define exceptions themselves. The term "exception" does not exist as a keyword in Python; rather, it's a general concept in programming. "Throw" is often associated with other programming languages, such as Java or C++, to indicate triggering an exception, but it is not used in Python. The keyword "catch" is used in some programming languages to handle an exception, but in Python, the analogous keyword is "except," which is part of the try-except block used for handling exceptions. Thus, "raise" is the correct choice for defining exceptions in Python.