Why did operation market-garden fail and what were the consequences?

Operation Market-Garden failed primarily due to overambitious planning, inadequate intelligence, and fierce German resistance, particularly at key bridges like Arnhem. The Allies underestimated the strength and readiness of German forces, leading to critical supply shortages and delays. Consequences included a significant loss of troops and equipment, the failure to secure a quick route into Germany, and a prolonged conflict that extended World War II in Europe. The operation highlighted the need for more cautious and well-coordinated strategies in future military campaigns.