Virtual Offside Line (VOL) is a technology used in association football (soccer) to assist the referee in making offside decisions. A computer-generated offside line is superimposed onto the television broadcast of the match, and is intended to help the officials determine whether a player is in an offside position at the moment the ball is played by a teammate.
Video Assistant Referee (VAR) is a system used in association football (soccer) to assist the referee in making decisions. It involves the use of video footage and a team of officials who can review decisions made by the on-field referee and advise them on any corrections that may be necessary. The VAR system is designed to help make more accurate decisions, particularly in relation to goals, penalties, red cards, and cases of mistaken identity.