The return statement sends a value back from a function to the caller.

It is used when a function needs to produce a result.

def add(x, y):
    return x + y

result = add(10, 20)
print(result)

If a function does not use return, Python returns None.

def f1():
    print("Hello")

print(f1())

Python can return more than one value from a function.

def sum_sub(a, b):
    return a + b, a - b

def fact(num):
    result = 1
    while num >= 1:
        result = result * num
        num = num - 1
    return result