Inzamam-ul-Haq was out in controversial circumstances in 2005
A run out is when the batsmen are going for a run or runs, but fall short of the batting crease when the stumps are broken by the fielding team.
The batsman must have some part of his bat or body grounded beyond the crease - on the line would be out.
This is why you see batsmen run that bat along the ground with an outstretched arm in front of them.
However, controversy struck in
England's second Test match against Pakistan in Faisalabad in November 2005
when Inzamam-ul-Haq was adjudged run out when he raised his back foot avoiding Steve Harmison's throw at the stumps.
Under law 38. 2 (a), "a batsman is not run out if he has been within his ground and has subsequently left it to avoid injury when the wicket is put down."
So that means a batsman cannot be run out when taking evasive action from a throw if he has not left his crease.
But square leg umpire Darrell Hair referred the decision to third umpire Nadeem Ghauri, who adjudged - wrongly - that Inzamam was out.
Run-out decisions are always difficult for umpires because it all happens so fast.
That is why at the highest level the umpire can choose to refer the decision to the third umpire, who can watch video replays.
Run-out decisions are more common in one-day games than in Test matches as the players have less time to accumulate the runs.
You can be run out off a no-ball.
The bowler does not get credited with the wicket.