Zita is correct.
Prior to a game, a grounds crew will spend hours grooming and conditioning the field of play. Unfortunately, prior to a game a team will take the field and exercise their fielding and other skills, doing no justice to the hard work of the grounds crews
Pepper is a game where a player will bat a ball softly on the ground or in the air to a group of fielders, oh, about thirty feet a way or more - but not much more. The fielders will in turn field the ball, then quickly flip it back to the player with the bat and this player will hit the ball again, in flight, and the routine starts all over again. Although this can be a lot of fun and a good exercise prior to a game for hand-eye coordination, it can mess up the playing surface.
Soft toss is a batting practice where a player tosses a ball to a batter, usually from a squatting posture at that batter's side - but out of the way of the swinging bat. The batter hits the ball into a net or other stopping device. The real problem is when the balls are batted right back into a fence, even worse, when the batters are making holes with their spikes near the fence right behind the plate.
Here are some examples of the NO PEPPER SIGNS and the NO SOFT TOSS SIGNS.