심폐소생술 (CPR) is a life-saving technique used in emergencies when someone's breathing or heartbeat has stopped. It involves a combination of chest compressions and rescue breaths to maintain blood flow and oxygenation to vital organs until professional help arrives. Performing 심폐소생술 can significantly increase the chances of survival in cases of cardiac arrest. It is important for bystanders to act quickly and confidently, as immediate intervention can make a critical difference. Training in 심폐소생술 is widely available and recommended for everyone to help save lives in emergencies.