A question about the "infinite loop".

def get_guess(bad_guesses, good_guesses):
    while True:
        guess = input("Guess a letter: ").lower()

        if len(guess) != 1:
            print("You can only guess a single letter!")
        elif guess in bad_guesses or guess in good_guesses:
            print("You've already guessed that letter!")
        elif not guess.isalpha():
            print("You can only guess letters!")
        else:
            return guess

This is infinite loop code block from the lesson. As per my understanding, there are two options to operate with this kind of loop. The first one is "break", this will break out of the loop. The second is "continue", this will skip the command after its line and continue the next round of the loop.

I want to recheck this because the code above it doesn't have any those command. So I incline that the "return" statement should return "false" to while loop somehow. But, I don't know the real mechanics over this. Could someone verify my statement above and give me more information on the mechanics of "return"?