Using the Chi-Squared test for feature selection with implementation

Let's approach this problem of feature selection using Chi-Square a question and answer style. If you are a video guy, you may check out our youtube lecture on the same. Question 1: What is a feature? For any ML or DL problem, the data is arranged in rows and columns. Let's take the example of a titanic shipwreck problem. Question 2: What are the different types of features?