Graph Theory is an important branch of mathematics and computer science that studies the relationships between objects through graphs and networks. With applications in communication systems, artificial intelligence, transportation, social networks, and data science, graph theory has become a powerful tool in solving modern computational problems. Advanced Graph Theory is designed to provide readers with a deeper understanding of advanced graph concepts and their practical significance. This book explores important topics such as graph connectivity, graph coloring, trees, planar graphs, Eulerian and Hamiltonian graphs, network flows, and optimization techniques. The concepts are presented systematically with mathematical explanations, proofs, algorithms, and practical examples to help readers strengthen their analytical and problem-solving abilities. The purpose of this book is to support students, researchers, and professionals in gaining advanced knowledge of graph theory and its applications. By combining theoretical foundations with real-world applications, this book aims to encourage logical reasoning, mathematical thinking, and innovative problem-solving skills in modern science and technology.