Bat and ball

Two different types of cricket balls:

i) A used white ball. White balls are mainly utilized in limited overs cricket, especially in matches played at night, under floodlights(left).
ii) A used red ball, Red balls are utilized in Test cricket and first-class cricket and some other forms of cricket (right).

NB Both balls are the same size.

The essence of the sport is that a bowler delivers the ball from his end of the pitch towards the batsman who, armed with a bat is "on strike" at the other end.

The bat is made of wood (usually White Willow) and has the shape of a blade topped by a cylindrical handle. The blade must not be more than 4.25 inches (108 mm) wide and the total length of the bat not more than 38 inches (970 mm).

The ball is a hard leather-seamed spheroid, with a circumference of 9 inches (230 mm). The hardness of the ball, which can be delivered at speeds of more than 90 miles per hour (140 km/h), is a matter for concern and batsmen wear protective clothing including pads (designed to protect the knees and shins), batting gloves for the hands, a helmet for the head and a box inside the trousers (to protect the crotch area). Some batsmen wear additional padding inside their shirts and trousers such as thigh pads, arm pads, rib protectors and shoulder pads. The ball has a "seam": six rows of stitches attaching the leather shell of the ball to the string and cork interior. The seam on a new ball is prominent, and helps the bowler propel it in a less predictable manner. During cricket matches, the quality of the ball changes to a point where it is no longer usable, and during this decline its properties alter and thus influence the match.

Umpires and scorers

An umpire

The game on the field is regulated by two umpires, one of whom stands behind the wicket at the bowler's end, the other in a position called "square leg", a position 15–20 metres to the side of the "on strike" batsman. The main role of the umpires is to adjudicate on whether a ball is correctly bowled (not a no ball or a wide), when a run is scored, and whether a batsman is out (the fielding side must appeal to the umpire, usually with the phrase How's That?). Umpires also determine when intervals start and end, decide on the suitability of the playing conditions and can interrupt or even abandon the match due to circumstances likely to endanger the players, such as a damp pitch or deterioration of the light.

Off the field and in televised matches, there is often a third umpire who can make decisions on certain incidents with the aid of video evidence. The third umpire is mandatory under the playing conditions for Test matches and limited overs internationals played between two ICC full members. These matches also have a match referee whose job is to ensure that play is within the Laws of cricket and the spirit of the game.

The match details, including runs and dismissals, are recorded by two official scorers, one representing each team. The scorers are directed by the hand signals of an umpire. For example, the umpire raises a forefinger to signal that the batsman is out (has been dismissed); he raises both arms above his head if the batsman has hit the ball for six runs. The scorers are required by the Laws of cricket to record all runs scored, wickets taken and overs bowled; in practice, they also note significant amounts of additional data relating to the game.

Innings

The innings (ending with 's' in both singular and plural form) is the term used for the collective performance of the batting side.  In theory, all eleven members of the batting side take a turn to bat but, for various reasons, an innings can end before they all do so. Depending on the type of match being played, each team has one or two innings apiece.

The main aim of the bowler, supported by his fielders, is to dismiss the batsman. A batsman when dismissed is said to be "out" and that means he must leave the field of play and be replaced by the next batsman on his team. When ten batsmen have been dismissed (i.e., are out), then the whole team is dismissed and the innings is over. The last batsman, the one who has not been dismissed, is not allowed to continue alone as there must always be two batsmen "in". This batsman is termed "not out".

An innings can end early for three reasons: because the batting side's captain has chosen to "declare" the innings closed (which is a tactical decision), or because the batting side has achieved its target and won the game, or because the game has ended prematurely due to bad weather or running out of time. In each of these cases the team's innings ends with two "not out" batsmen, unless the innings is declared closed at the fall of a wicket and the next batsman has not joined in the play.

In limited overs cricket, there might be two batsmen still "not out" when the last of the allotted overs has been bowled.

Overs

The bowler bowls the ball in sets of six deliveries (or "balls") and each set of six balls is called an over. This name came about because the umpire calls "Over!" when six balls have been bowled. At this point, another bowler is deployed at the other end, and the fielding side changes ends while the batsmen do not. A bowler cannot bowl two successive overs, although a bowler can bowl unchanged at the same end for several overs. The batsmen do not change ends and so the one who was non-striker is now the striker and vice versa. The umpires also change positions so that the one who was at square leg now stands behind the wicket at the non-striker's end and vice versa.