Bat speed refers to how quickly a baseball bat moves through the air during a swing. It is an important factor in hitting because a faster bat speed can lead to harder hits and better contact with the ball. Players often work on increasing their bat speed through strength training and technique improvement. Measuring bat speed can be done using various tools, such as radar guns or specialized sensors. Higher bat speeds are typically associated with greater power and distance in a hit, making it a key focus for players, coaches, and analysts in the sport of baseball.