What is the "parking the bus" strategy in soccer, and when is it typically employed?

Parking the bus” is a defensive strategy in soccer where a team heavily prioritizes defense by positioning most, if not all, of their players behind the ball, often in their own half or penalty area. This tactic aims to frustrate the opposition’s attacking efforts and protect a lead or secure a draw, especially against stronger or more attacking-oriented teams. It involves compact defensive organization, disciplined marking, and swift counter-attacks when possession is regained.