In cricket, a batsman may retire from an innings at any time when the ball is dead; they must then be replaced by a teammate who has not been dismissed. The most common reason for retirement is if the batsman becomes injured or unwell, in which case they can resume their innings .
Retirement is covered by Law 25 of the Laws of Cricket, which distinguishes between two types of retirement. If the batsman is ill or injured they are considered retired - not out and are permitted to return to batting if they recover. In all other cases the batsman is considered retired - out and may not return to the innings, unless the opposing captain offers an exemption. These two types of retirement are considered differently in cricket statistics.