What are Ground Rules in Baseball?

A quick explanation of what ground rules refer to in baseball.

[@wrainmaker6283]

Exactly what I was looking for. I’m playing MLB The Show and just hit one to the Monster in left-center. It hit left of the line and went behind the shorter wall. It was ruled a HR and I was wondering if it shouldn’t be a double since it hit left of the line.

[@gabbyty7144]

that's a slash not a backslash

[@osker4615]

pawwk, hahah

[@ericfleury1039]

Weird that at 0:40 it's just a blank screen with a person talking for about 15 seconds.