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What is Decision Tree ?**
Decision Tree is supervised machine learning algorithm used for classification and regression problems.
Classification deals with predicting class of discrete values like 0/1 or predicting if some one is having disease or not where as Regression deals with predicting continues values like salary of a person, house price etc.
Intuition
As the name goes, it uses a tree-like model for taking decisions. A decision tree is drawn upside down with its root at the top .It also consist of internal nodes, leaf node which we will discuss further.
It works like a human brain to decide. Like in below picture if we need to check if a person is fit or not it will check certain criteria and based on that it will decide and return the result. In Machine learning we can do this with Decision Tree Classifier.

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