Which keyword is used to define a function in Python?

In Python, the keyword used to define a function is "def." This keyword initiates the function definition and indicates to the Python interpreter that a function is being declared. Following "def," the user specifies the function name and any parameters that the function may take in parentheses.

For example, the syntax for defining a simple function in Python is:

def my_function(param1, param2):
    # function body
    return param1 + param2

In this case, "def" signals the start of the function definition, followed by the function's name and its input parameters. This structure is essential for creating reusable blocks of code that can be executed when the function is called later in the program. Understanding the use of "def" is crucial for writing and organizing code effectively in Python.