VAR explained: How the Video Assistant Referee system works

Premier League clubs have "agreed in principle" to bring in the Video Assistant Referee system from next season, it was announced on Thursday.

During a shareholders' meeting, clubs were presented with an update on the non-live trials taking place, as well as "key learnings" from VAR's use in the FA Cup and Carabao Cup as well as from other leagues being discussed.

A formal request will now be made to both lawmakers the International Football Association Board and FIFA, the world governing body.

A statement from the Premier League said its testing programme would continue for the rest of the season, "with a continued emphasis on those Saturday afternoons which have several matches being played concurrently".

How VAR decisions are communicated to fans in the stadium is to also be addressed, with the development of a "clear protocol" to be established.

READ MORE: VAR to be used in Premier League from next season

READ MORE: Gerrard: I don't want Liverpool job... yet

READ MORE: Lacazette over Arsenal frustration and enjoying life at 'great club'

Here's everything you need to know about the system...

How VAR works

VAR operates on a three-step process of incident, review/advice, decision, and across the four jurisdictions of football deemed 'game changing' by Fifa.

The IFAB says VAR is only to be used "to correct clear errors and for missed serious incidents" in those "match-changing" situations.

VARs and other match officials are able to recommend reviews, but the only person who can initiate one is the referee, who will then have the final say on whether their original decision should stand or be changed.

They have the option to review footage themselves on a pitch-side monitor before making a final decision.

Goals

VARs are used here to help the referee determine whether an infringement was made that should result in the goal not being awarded.

Penalties

Here, VAR will look to ensure that the correct decision was made regarding the award or non-award of a penalty.

Red cards

Much like with penalty decisions, VAR will look to ensure that the correct decision was made.

Mistaken identity

VAR will clarify which players should be cautioned or sent off, or correct the referee in the event of mistaken identity.