Product metrics are software metrics that measure the characteristics of the software product itself, such as its functionality, quality, complexity, and maintainability. These metrics can help you assess the design quality of your software product and identify potential defects, risks, and improvement opportunities. For instance, Lines of Code (LOC) measures the size of the software product by counting the number of lines of code. This metric can be used to estimate the effort, cost, and duration of the software project, as well as the productivity and quality of the software development team. Cyclomatic complexity (CC) is another metric that measures the complexity of the software product by counting the number of linearly independent paths through the code. This metric can be used to evaluate the maintainability, testability, and readability of the code, as well as the likelihood of errors and bugs. Additionally, Coupling and Cohesion (C&C) measure the degree of interdependence and modularity of the software product. A low coupling and a high cohesion indicate a good design and a high quality of the software product.