We can use loops inside other loops, such types of loops are called nested loops.

Example: nesting for loop in while loop

while (i <= 3):
    for k in range(1, 4):
        print(i, "*", k, "=", (i * k))
    i = i + 1
    print()

Output:

1 * 1 = 1
1 * 2 = 2
1 * 3 = 3

2 * 1 = 2
2 * 2 = 4
2 * 3 = 6

3 * 1 = 3
3 * 2 = 6
3 * 3 = 9

Example: nesting while loop in for loop

for i in range(1, 4):
    k = 1
    while (k <= 3):
        print(i, "*", k, "=", (i * k))
        k = k + 1
    print()

Output:

1 * 1 = 1
1 * 2 = 2
1 * 3 = 3

2 * 1 = 2
2 * 2 = 4
2 * 3 = 6

3 * 1 = 3
3 * 2 = 6
3 * 3 = 9