What is Graph Labeling? What is Graph Theory? How Graph Labeling is Used in Real life and day to day life? How Graph Theory is Used in Real life and day to day life? Now a days many students and Researcher asked that what is the use of mathematics in real life. This book gives some basic knowledge about the application of Graph labeling and Graph Theory in real life which is the one branch of mathematics. It is designed for the researcher who research in Graph labeling & Graph Theory, this book gives the basic knowledge about the application of graph labeling and graph theory in real life and Day to Day life.