Cold aisle containment is a data center cooling strategy that involves enclosing the cold aisles where servers and IT equipment are located. This setup helps to prevent warm air from mixing with the cold air supplied by cooling units, ensuring that the equipment receives optimal cooling. By using physical barriers, such as doors and panels, cold aisle containment improves energy efficiency and reduces cooling costs. It allows for better airflow management, which can enhance the performance and lifespan of the equipment while minimizing the risk of overheating.