Final answer:
The 'break' command in the given program exits the infinite loop once the user correctly guesses the magic number, preventing further unnecessary prompts for input.
Step-by-step explanation:
The break command in programming is used to exit a loop prematurely when a certain condition is met. In the example program you provided, the while True loop creates an infinite loop which will continue to execute until the break command is encountered. This happens when the user's guess equals the magic_number. The benefit of using the break command here is that it allows the program to stop asking the user for input once the correct number is guessed, thereby ending the loop and preventing unnecessary repetition of code or infinite loops.