There are two types of bowlers in cricket: right-handed bowlers and left-handed bowlers. Over the wicket and round the wicket are different for each type of bowler.
Over-the-wicket and Round-the-wicket for a right-handed bowler
If you are a right-handed bowler, the left side of the wicket will be your over-the-wicket and the right side of the wicket will be your round-the-wicket.
Over-the-wicket and Round-the-wicket for a left-handed bowler
If you are a left-handed bowler, the left side of the wicket will be your round-the-wicket and the right side will be your over-the-wicket.
According to the rules of cricket when a bowler comes to bowl he bowls around the wicket or over the wicket. The umpire has to tell the bowler in which spell he will bowl. And the umpire informs the batsman.
If a right-handed bowler comes to bowl over the wicket, then he must inform to umpire right-hand- over-the-wicket. And if he wants to bowl round the wicket, he should say right-hand-round-the-wicket.
If a left-handed bowler comes to bowl over the wicket, then he must inform the umpire of left-hand- over-the-wicket. And if he wants to bowl round the wicket, he should say
And if a bowler changes the spell without informing the umpire, then the umpire declares it as a no-ball.
I hope you have learned about the Over the Wicket and Round the Wicket.