3 decision tree-based algorithms for Machine Learning

Decision trees are a tree algorithm that split the data based on certain decisions. Look at the image below of a very simple decision tree. We want to decide if an animal is a cat or a dog based on 2 questions. We can answer each question and depending on the answer, we can classify the animal as either a dog or a cat. The red lines represent the answer "NO" and the green line, "YES".