First aid is emergency care provided until full medical treatment is available. It aims to preserve life, prevent further injury, and promote recovery through steps like opening airways, stopping bleeding, and treating for shock. Key skills include CPR, splinting, and wound treatment. A first aid kit should contain dressings, bandages, gloves, and other supplies. The principles of first aid are to preserve life, prevent further injury, promote recovery, take immediate action, and call for help.