Graph theory is a branch of mathematics, which studies the properties and applications of graphs. A graph consists of a finite set of vertices and a set of edges between vertices. The value of graph theory lies in that it can solve many practical problems, such as social network analysis, traffic planning, circuit design and so on.

Graph theory is also widely used in computer science. It can be used to solve the shortest path problem, minimum spanning tree problem, network flow problem and so on. These problems have important applications in computer networks, database management, artificial intelligence and other fields.

In addition, graph theory is closely related to combinatorial mathematics, algebraic topology, mathematical logic, differential geometry, quantum computing and so on. It provides powerful tools and methods for these fields.

In a word, the research value of graph theory lies in that it can solve many practical problems and is widely used in computer science and other fields. It provides us with a powerful tool to help us better understand and solve problems in the real world.