Cyclomatic Complexity (CC) is a measure used to evaluate the complexity of a software module, representing the number of different paths in the source code. It can be calculated by counting the number of edges and nodes in the control flow graph, with each method call or keyword increasing the complexity by one. While high CC does not necessarily indicate poor quality, it can suggest that logic is complex and may require more testing. A suitable low level of CC for methods and classes is more important than the total CC value, as it affects maintainability, separation of logic, and risk of injecting bugs. Understanding CC helps developers evaluate source code quality and identify areas for improvement.