• There are numerous implementations of decision trees, but one of the most well-known implementations is the C5.0 algorithm.• The C5.0 algorithm has become the industry standard to produce decision trees, because it does well for most types of problems directly out of the box.• Compared to other advanced machine learning models, such as those described in Black Box Methods - Neural Networks and Support Vector Machines, the decision trees built by C5.0 generally perform nearly as well, but are much easier to understand and deploy.