A single is a hit that allows the hitter to advance to first base. A strike is defined as a swing and a miss or a ball pitched in the strike zone. A walk is when a batter forces the pitcher to take him out by hitting with no one out. A HBP is when a batter hits a pitch off of any part of his body other than his hand(s). A error occurs when a fielder misses a play at first base or home plate.
A double is when a batter scores two runs. A triple is when a batter gets three bases safely. A homer is when a batter hits a ball over the fence. An RBI is when a batter drives in a run. A sac fly is when a batter hits into an inning-ending forceout at any time during the course of an inning. A stolen base is when a baserunner takes off from first base or third base and tries to go all the way around to score on a throw from the catcher.
A perfect game is when a pitcher strikes out the entire team on nine consecutive pitches. A no-hitter is when a pitcher does not allow anyone to reach base via a hit or a walk. A complete game is when a pitcher goes the full nine innings and achieves this feat more often than not.
A strike is called when the ball is pitched in the strike zone and the batter fails to hit it. If the ball lands outside of the strike zone and the batter does not swing, it is considered a "ball." They can walk to first base four times, which works against the pitcher. A player can only be awarded with a base on balls once per game.
If the ball lands within the strike zone but the batter does not make contact with it, it is considered a "strikeout" and the batter will lose one base score during an at-bat. This occurs most often when a pitch is way out of the zone or is a ball that bounces away from the hitter; sometimes the pitcher'll throw a very wide pitch and let it land inside the zone so they don't have to give up a base on balls. If the batter strikes out looking, the runner on second base may advance him there in time for the next batter.
In college baseball, if a pitch is thrown within the strike zone but misses the plate by more than half of an inch (1 cm), a ball is declared and a new ball is used by the pitcher before the next pitch. In the MLB, such pitches are usually just declared a ball and the batter has a free pass.
With fewer than two strikes against them, a "strike" is declared when the batter fails to swing at a pitch that crosses the plate in the strike zone, swings at a pitch and misses, or smacks the ball out of bounds. They're out after three strikes, and the next batter comes up to bat.
A strike can be called by either the home team or the visiting team. If the home team wants the visitor to walk a batter, they will signal this by waving a white towel or flag over their head. If this does not work, then the umpire can call a strike by pointing to any part of the body except his own face. The signal for a strike is three sharp blows on the bell of the ball, once for each strike called.
In addition to these signals, an umpire can also call a strike by simply raising a finger to indicate where on the body to make contact. This is known as a "manual" strike. It can be used by the home team if they want the batter to take another step forward before being allowed to proceed with their assault on the pitcher's mound.
Finally, an umpire can call a strike by foot. This means that instead of using their hand to show where on the body to make contact, they will point to the ground directly in front of them. This is most commonly seen in baseball but is permitted in softball too.
A strike occurs when a batter swings at a pitch and misses, or when a pitch is in the strike zone (whether the hitter swings or not). The hitter is out after three strikes! When a hitter hits a foul ball and has less than two strikes, they are additionally granted a strike. Thus, a player is automatically awarded a strike if they fail to swing at a pitch within the strike zone.
In addition, if a batter gets a base on balls but then takes first base before the pitcher delivers the next pitch, he will be awarded a second strike. This applies only if the batter fails to advance beyond first base with the extra base on the base hit. If he advances further than first base, he loses his second strike.
Finally, if the batter gets a third strike on four pitches, the umpire has the right to immediately call time out and replace the pitcher with a substitute. The batter then has the opportunity to take another plate appearance during the next stoppage in the game. If the batter does not take another plate appearance before the end of the game, this turn at bat is considered finished and it becomes their last chance to bat during the game.
In conclusion, there are three strikes against a player before they are removed from the game. A fourth strike ends the game immediately without giving the player another chance to bat.