Implantable Cardioverter Defibrillators (ICDs) are advanced cardiac devices designed to continuously monitor heart rhythms and automatically deliver life-saving therapy when dangerous ventricular arrhythmias are detected. They provide electrical shocks or pacing to restore a normal heartbeat, helping prevent sudden cardiac arrest in high-risk patients. Engineered for long-term reliability, precise detection, and patient safety, ICDs play a vital role in the management of serious cardiac rhythm disorders while improving survival and quality of life.