Decision Review System

Decision Review System (DRS) is a technology based system, frequently used in sports (predominantly in cricket). It refers to the process to examine the decision given by the on-field umpire. The system enables to take the decision whether a batsman is out or not. Initially, ICC made it mandatory to be used in all matches, but later on, it was made optional. If both the team shows positive response with the use of DRS in the match, they may use it.

DRS consist of three major components:- 

• Hawk-eye - A technology which tracks the movement of balls. It keeps a close eye view on the delivery of the ball which was interrupted by the batsman (generally by pads) and determines whether the ball has hit the stumps.
• Hotspot - Infrared imaging system that provides clarity whether the ball has hit the pad or bat.
• Ultra-edge - It is termed as Hot Spot's enhanced version of Snickometer. It clearly differentiates sounds created by bat, pads or clothing.
• Real-time Snickometer – It tracks the small sound made when the ball hits the bat or pad, using a directional microphone.