Mouth-to-Mouth Resuscitation is a lifesaving technique used when someone has stopped breathing. It involves sealing your lips around the person's mouth and blowing air into their lungs. This method helps deliver oxygen to the body until professional help arrives or the person starts breathing on their own. To perform Mouth-to-Mouth Resuscitation, first ensure the area is safe. Tilt the person's head back slightly to open the airway, pinch their nose shut, and give two breaths, each lasting about one second. Watch for the chest to rise, indicating that air is entering the lungs.