The ABS challenge system has officially arrived in Major League Baseball, marking a major shift in how balls and strikes are called. After years of testing, the league is now giving players the ability to challenge key pitches in real time.

In these videos, we break down exactly how the system works, what has changed with the strike zone, and how it could impact players across the league, including stars like Aaron Judge.

If you want to understand what this means for the future of the game and how it will affect every at-bat, this is everything you need to know.