This reference book, Basics of Algal Science, is designed to give undergraduate and graduate botany students a thorough understanding of the habitat, thallus structure and cell structure of algae. Along with their economic and biotechnological applications, it covers basic elements like classification, reproduction, and ecological significance. For ease of understanding and scholarly reference, the text is presented in a clear and organized manner. For improved conceptual clarity, figures and tables have been proposed at pertinent sections. For students, instructors, and researchers interested in phycology, this book seeks to be a trustworthy academic resource.