Conventional e-learning systems are more user-centered and have a wider range of users. However, they are also more complicated for inexperienced and unprepared users, and they leave users feeling alone with little support from peers or teachers. An adaptive learning system is required to provide content that changes dynamically until users become comfortable with the concepts. Author of this book, focus on needs to provide individualized instructions depending on each student's talents or preferences in order to improve or accelerate their performance. Author's main goal in this book is to create a framework for conceptual knowledge representation and content retrieval based on individual personnel's conceptual searches for Ontology-Based Customized E-Learning System teaching materials. Two key strategies for delivering tailored material and adaptive learning are presented in this book. With the help of ontology-based Customized E-Learning application, students can enhance their learning process and instructors can deliver content using adaptive teaching approaches. Overall, this book is a valuable resource and useful tool for Educators, Professional, Students, Researchers, Parents, Student Activists, Social Workers, Family Consultant and Caregivers.