Explain the iteration and recursion for beginner

iter_rec_diff.py

def fact1(n):
    acc = 1
    for i in range(n):
        # print(acc, i + 1)
        acc *= (i + 1)

    return acc


def fact2(n):
    return 1 if n == 1 else n * fact2(n - 1)


print(fact1(5))
# 120 = 1 * 2 * 3 * 4 * 5

print(fact2(5))
# fact2(5) = 5 * fact2(4)
# = 5 * 4 * fact2(3)
# = 5 * 4 * 3 * fact2(2)
# = 5 * 4 * 3 * 2 * fact2(1)
# = 5 * 4 * 3 * 2 * 1