This book presents a simple yet elegant introduction to classical optics focused primarily on establishing fundamental concepts for students new to the field. With examples demonstrating the use of optics in a wide range of practical applications, it reflects the pedagogical approach used by Prof. Mejía-Barbosa to teach his Fundamentals of Optics course at the Universidad Nacional de Colombia. This book will prove useful for undergraduate and graduate students of physics, optical science and engineering, and any other related science or engineering discipline that deals with optics at some level. Readers are invited to study the fundamental principles of optics and find pleasure in learning about this fascinating and vibrant field. Translated by Herminso Villarraga-Gómez.