DRS stands for Decision Review System, and it is a technology-based system used in cricket to assist the match officials in their decision-making. The system was first introduced in Test cricket in 2008 and has since been implemented in limited-overs formats. The system enables players to challenge decisions made by the on-field umpires, and it helps to work out LBW (Leg Before Wicket), unclear catches, nicks off the bat, and run-outs. There are two types of reviews in DRS: Umpire Review and Player Review. On-field umpires may choose to consult with the third umpire (known as an Umpire Review), and players may request that the third umpire consider a decision of the on-field umpires (known as a Player Review) . The technology used in DRS includes ball-tracking technology, UltraEdge, and Real Time Snicko. The system has generally received a positive response from players and coaches since its launch. Each team is allowed to make a maximum of two unsuccessful reviews per innings in Test cricket, and one unsuccessful review per innings in limited-overs cricket.