Micro-Electro-Mechanical Systems (MEMS) have revolutionized various industries, including automotive, aerospace, healthcare, and consumer electronics. These tiny devices integrate mechanical and electrical components, enabling innovative applications such as sensors, actuators, and resonators. Ville Kaajakari's book, "Practical MEMS," provides a hands-on guide to designing, fabricating, and testing MEMS devices. This write-up summarizes the key aspects of the book and its significance in the field of MEMS.