The team can decide where to put the infielders and outfielders. Players often stand at slightly different places on the field between some plays. These changes are called "shifts". The fielders may shift at any time. Players can shift for many reasons. One of the more popular ones is the "defensive shift", where players move in the infield. They do this because they know that some batters can only hit a ball a certain direction. It can also be easier to make a double play when fielders are moved a certain way.