Function reverse string

#Create a function that accepts a string and returns the same string reversed.
def reverseString(givenString):
    backString = ""
    for index in range(len(givenString)):
        backString = backString + givenString[-1-index]

    return backString

print("abcde" + "  ->  " + reverseString("abcde"))
print("Is This Working?" + "  ->  " + reverseString("Is This Working?"))