Muzzle velocity refers to the speed at which a projectile, such as a bullet, exits the barrel of a firearm. It is typically measured in meters per second (m/s) or feet per second (fps). Higher muzzle velocity can lead to greater accuracy and distance, as the projectile travels faster and is less affected by gravity and air resistance. Factors that influence muzzle velocity include the type of ammunition, the length of the firearm's barrel, and the amount of gunpowder used. Different firearms, such as rifles and handguns, can have varying muzzle velocities based on their design and intended use.