What is a defensive indifference in baseball?

That is a term generally used when a base runner is stealing a base. The catcher will not attempt to make a play on the runner (throw the ball to the base that the runner is attempting to steal). Sometimes, the official scorer will rule this 'defensive indifference' and not award the runner with a stolen base. You might see this in the 9th inning of a game where the team batting is down by several runs and the defensive team is more concerned with getting the batter out than attempting to throw out a base runner attempting to steal since that run will not affect the outcome of the game.