Cardiac Pacemakers are compact, implantable devices that regulate abnormal heart rhythms by delivering precise electrical impulses to maintain a steady heartbeat. Ideal for treating bradycardia, heart block, and certain arrhythmias, they consist of a pulse generator (titanium-encased battery and circuitry) connected to leads positioned in the right atrium or ventricle via minimally invasive transvenous implantation. Modern models offer dual-chamber pacing, rate-responsive sensors adapting to activity, MRI-conditional designs, and remote monitoring via Bluetooth for longevity up to 10-15 years. Biocompatible and hermetically sealed, they restore cardiac output, alleviate symptoms like fatigue and syncope, and improve quality of life across adults and pediatrics.