Earthquakes are sudden releases of energy from Earth’s crust that create seismic waves, typically occurring along fault lines. These geological events are classified into five main types: tectonic, volcanic, collapse, explosion, and reservoir-induced earthquakes. Understanding earthquake mechanics, measurement scales (Richter and Mercalli), and global distribution patterns is essential for comprehending their impact on human society and infrastructure. This comprehensive guide explores earthquake science, from crustal dynamics to safety preparedness.