The current edition of this book is intended towards imparting a basic understanding of biomolecules to the students of higher secondary schools and undergraduate programs of health science specialties. An attempt has been made to present the existing knowledge on biomolecules in a lucid language so as to be productive in terms of ease of learning. It is important to mention that the title covers only major categories of biomolecules which are considered to be of significant value in life processes. In short, the book is a compilation of notes for an instant review on the title "BIOMOLECULE".