A control flow graph is a visual representation of the flow of control within a program or software system.

It is a directed graph that shows the sequence of execution of various statements or blocks of code in a program.

The nodes of the graph represent individual statements or blocks of code, while the edges represent the flow of control between them. In a control flow graph, each node is connected to its successor nodes by directed edges, which indicate the order in which the statements are executed.

The graph can help developers understand the structure of a program, identify potential bugs or inefficiencies, and optimize the code for better performance. By analyzing the control flow graph, developers can identify loops, branches, and other control structures within the code.

This can help them understand the logic of the program and make informed decisions about how to improve its design and efficiency.

Additionally, control flow graphs can be used in program analysis and optimization techniques, such as data flow analysis and code coverage analysis. Overall, control flow graphs are a valuable tool for software developers to gain insights into the structure and behavior of their code, allowing them to write more efficient and reliable software.