Which Python built-in function would you use to convert a string into a number?

To convert a string into a number in Python, you can use the built-in functions int() or float(), depending on whether you want an integer or a floating-point number. The int() function is used to convert a string into an integer, while float() is used to convert a string into a float number. str() converts other data types to string and list() converts other types to list.