How do you define a function in Python?

To define a function in Python, the correct approach is to use the 'def' keyword. This keyword is specifically designed for creating functions, followed by the function name and parentheses that may contain parameters. This syntax is part of the Python language structure, allowing the interpreter to recognize that a function is being defined.

When you use 'def', you set the stage for writing the function body, which is indented beneath the definition line. This clear structure aids in both readability and functionality, enabling developers to define reusable code blocks effectively.

Other options do not reflect the standard syntax for defining functions in Python. The 'function' and 'define' keywords do not exist in Python, while 'method' is typically used in the context of object-oriented programming to refer to a function that is associated with an object. Thus, they cannot be used to define a standalone function.