This document summarizes smart materials and their applications in engineering. It discusses different types of smart materials like magnetorheological fluids, shape memory alloys, and piezoelectric materials. These materials can change their properties in response to external stimuli like magnetic fields, temperature changes, or electric currents. The document then explores various applications of smart materials in vibration damping, shape control, noise reduction, sensing, and energy harvesting. It provides examples of using these materials in seat shock absorbers, surgical implants, eyeglasses, and backpack power generators. In conclusion, the author assigns homework for students to write a report on piezoelectric materials and their physics, history, and applications.