In the world of football, we revise any decision with the help of VAR. This technology has already been used by many contries.and it's still being used in the World Cup .
VAR is usedd in 4 places

1. GOALS
   If ever a team has made a goal or an off side event has happened.
   

2.PENALTIES
Whenever a team has to penalize the awords and there is some mistake in it. it used at that time.

3.STRAIGHT RED CARD
When a player makes a dangerous takkle and he is injured at thet time then with the help of VAR we can give the re card to the player.

4.MISTAKEN IDENTITY
When a referee has given a wrong base to player , then we correct the mistake with the of VAR

• VAR TIME LIMITS
When the referee stops the game and then restart, the time between VAR is to decide.

VAR is a technology system run by the referee's group. its location is in a remote area and there is a TV screen on the outside and the TV screen shows matches from different angles. So whenever a player makes a mistake, he gives the news to the field referee, and stops the match and tells it to the players.
If the on field referee has a doute, then he takes the help of a reactangle type signal and clears it