This code defines a function called `square_number` that takes a...

This code defines a function called square_number that takes a list of numbers as input, squares each number in the list, and returns a new list containing the squared numbers. The code then creates a list of numbers [1, 2, 3, 4, 5], calls the square_number function with this list as input, stores the returned squared numbers in a variable called squared_numbers, and finally prints out the squared numbers.