How many balls must be thrown to a batter before it is considered a walk?

A batter is awarded a walk, also known as a base on balls, after they receive four pitches that are outside the strike zone and do not induce a swing from the batter. This rule is in place to promote fair play and encourage offensive opportunities. If a pitcher has thrown four such balls without the batter having swung, the batter can freely advance to first base. This mechanic is crucial within the game as it emphasizes the balance between pitching and hitting, allowing batters an opportunity to get on base without making contact when the pitches are deemed too difficult to hit. In contrast, three balls would create a situation in which the batter is still in a position to swing at the next pitch, thereby not fulfilling the condition necessary for a walk.