Control flow testing is a software testing technique that focuses on the execution paths within a program. It aims to ensure that all possible paths through the code are tested, helping to identify logical errors and improve code quality. By analyzing the control flow graph, testers can determine which parts of the code have been executed and which have not. This method is particularly useful for detecting issues in complex conditional statements and loops. By systematically testing different paths, control flow testing enhances the reliability of software applications, ensuring they function as intended under various conditions.