Acute Coronary Syndrome (ACS) refers to a range of conditions caused by reduced blood flow in the coronary arteries, with chest pain being the most common symptom. ACS is classified into unstable angina, NSTEMI (non-ST elevation myocardial infarction), and STEMI (ST elevation myocardial infarction) based on ECG findings and cardiac enzyme levels. Unstable angina involves a non-occlusive thrombus and normal ECG/enzymes, while NSTEMI involves a non-occlusive thrombus causing some tissue damage and mild enzyme elevation. STEMI is the most severe form, with complete thrombus occlusion, ST elevations on ECG, and elevated enzymes. Management involves aspirin, nitrates