BLS or Basic Life Support as it implies is the basic aid provided to an individual who suddenly loses consciousness and suddenly stops breathing. Basic life support is a first aid measure to maintain the ABCs which stand for airway, breathing and circulation without auxiliary equipment.The AHA’s ACLS course builds on the foundation of lifesaving BLS skills, emphasizing the importance of preventing cardiac arrest and managing cardiac arrest. The course reflects science and education from the 2020 American Heart Association Guidelines for CPR and Emergency Cardiovascular Care (ECC).