This lecture covers the basics of Optical MEMS, including actuation mechanisms like electrostatic and magnetic actuators, and explores their applications in consumer electronics, telecommunications, and fiberoptic communication systems. It also delves into the market overview of MEMS devices and the key metrics in fiber-optic telecom devices. Additionally, it discusses MEMS tunable lasers, semiconductor lasers, fiber types, and SOI surface micromachining, providing insights into the technology and design considerations in the field of Optical MEMS.