First aid involves providing immediate care for injuries and illnesses. The objectives are to alleviate suffering, prevent further injury, and prolong life. It is important to minimize harm by properly treating conditions like soft tissue injuries, eye injuries, poisoning, bone fractures, burns, heat illness, and providing CPR or clearing airway obstructions. CPR involves chest compressions, rescue breathing, and using an AED as needed to try to restore a normal heart rhythm until emergency help arrives.