What is the difference between leg-spin and off-spin in Cricket?

Question

Saqlain Mushtaq was the inventor of the 'doosra' and he bowled it quite well-A 'googly' is a delivery that a leg spinner-

Answer 1

Off spin is one of the two broad classes of spin bowling (the other being leg-spin). Right-handed off spin bowlers spin the ball so that, to a right-handed batsman, the ball spins towards the batsman, from the off side to the leg side when it bounces. ... Off-break bowlers mostly use just their fingers to produce the spin.

Answer 2

Off spin is a type of finger spin bowling in cricket. ... This contrasts with leg spin, in which the ball spins from leg to off and which is bowled with a very different action. A left-handed bowler who bowls with the same action as an off spinner is known as a left-arm orthodox spin bowler.