Users who bought this… Also bought this…‘ can be considered as the statement of this generation. There is not a single shopping application not showcasing this feature to gain more from the buyers. We humans always look for more similar things which we like. This rule is another by-product of Machine Learning called ‘Association Rules’. Association Rule Mining is based on two set of rules:  1) Look for the transactions where there is a bundle or relevance of association of secondary items to the primary items above a certain threshold of frequency; 2) Convert them into ‘Association Rules’. Link