Question: Why might a batter make a sacrifice bunt?
About the article "Baseball", section "Batting and baserunning tactics".

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In baseball, a sacrifice bunt (also called a sacrifice hit) is a batter's act of deliberately bunting the ball, before there are two outs, in a manner that allows a runner on base to advance to another base.
The batter is almost always sacrificed (and to a certain degree that is the intent of the batter) but sometimes reaches base due to an error or fielder's choice.
Sometimes the batter may safely reach base by simply outrunning the throw to first; this is not scored as a sacrifice bunt but rather a single.
The most opportune situations for sacrifice bunts occur when a runner is on first base, or runners are on both first and second base.
The runners try to advance as soon as they see the ball bunted.
A properly executed sacrifice bunt in this scenario would put the ball up the first base line with a runner on first, or down the third base line with runners at first and second.
This avoids a double play and results in the runner(s) advancing to second (and third) base, "in scoring position".
A successful sacrifice bunt does not count as an at bat, and does not impact a player's batting average; it does count as a plate appearance.
However, unlike a sacrifice fly, a sacrifice bunt does not count against a player in determining on-base percentage.
However, if the official scorer believes that the batter was attempting to bunt for a base hit, and not solely to advance the runners, the batter is not credited with a sacrifice bunt, and is charged an at bat.
In leagues without a designated hitter, sacrifice bunts are most commonly attempted by pitchers, who are typically not productive hitters.
Managers consider that if a pitcher's at bat will probably result in an out, they might as well go out in a way most likely to advance the runners.
Some leadoff hitters also bunt frequently in similar situations and may be credited with a sacrifice, but as they are often highly skilled bunters and faster runners, they are often trying to get on base as well as advance runners.
A sacrifice bunt attempted while a runner is on third is called a squeeze play.
A sacrifice bunt attempted while a runner on third is attempting to steal home is called a suicide squeeze.
Although a sacrifice bunt is not the same as a sacrifice fly, both fell under the same statistical category until 1954.
In scoring, a sacrifice bunt may be denoted by SH, S, or occasionally, SAC. 
Sacrifice bunt.
In a sacrifice bunt, the batter will put the ball into play with the intention of advancing a baserunner, in exchange for the batter being thrown out.
The sacrifice bunt is most often used to advance a runner from first to second base, although the runner may also be advanced from second to third base, or from third to home.
The sacrifice bunt is most often used in close, low-scoring games, and it is usually performed by weaker hitters, especially by pitchers in games played in National League parks.
A sacrifice bunt is not counted as an at-bat.
In general, when sacrifice bunting, a batter will square to bunt well before the pitcher releases the ball.
The squeeze play occurs when the batter sacrifices with the purpose of scoring a runner from third base.
In the suicide squeeze, it is integral that the batter bunt the ball, or the runner—who is running towards home with the pitch—will likely be tagged out easily.
Due to the high-risk nature of this play, it is not often executed, but can often be an exciting moment within the game.
If a runner scores in a squeeze play, the batter may be credited with an RBI. 
 A sacrifice bunt (also called a sacrifice hit or simply a "sacrifice") is the act of deliberately bunting the ball in a manner that allows a runner on base to advance to another base, while the batter is himself put out.
If the sacrifice is successful, the batter is not charged with an at bat (AB).
But he is credited with an SAC or S or SH.  
 When a batter turns his stance from being sideways to the pitcher's mound to facing the pitcher's mound.
This is typically done when a batter prepares to bunt a ball, in particular when he intends to do a sacrifice bunt.
"Whether you square around or pivot, you want to make sure you are in a comfortable and athletic position to bunt the ball.
Your knees should be bent and your bat should be held out in front of your body.
The barrel of the bat should be at the same height as your eyes and at the top of the strike zone".  
A swinging bunt occurs when a poorly hit ball rolls a short distance into play, much like a bunt.
A swinging bunt is often the result of a checked swing, and only has the appearance of a bunt.
It is not a true bunt, and if the scorer judges that the batter intended to hit the ball, it cannot be counted as a sacrifice.
There is also a "slug" bunt that is intended to surprise the opposing defense, as the desired effect is a hard-hit ball into the infield defense that is expecting a standard bunt.