1. A method for discovery of relevant data in massive datasets, the method comprising: receiving, by data relevancy analyzer, one or more compare datasets wherein the one or more compare datasets comprises one or more compare key fields and one or more compare data fields; receiving, by the data relevancy analyzer, a core dataset wherein the core dataset comprises one or more target data fields and one or more core key fields for determining data relevancy with the one or more compare datasets; matching, by the data relevancy analyzer, at least one field name of the one or more compare key fields and the one or more compare data fields with at least one field name of the one or more core key fields wherein each matching field name is one of one or more target key field candidates; determining, by the data relevancy analyzer, one or more shared key fields based on a correlation of the one or more target key field candidates and the one or more target data fields; categorizing, by the data relevancy analyzer, the one or more compare datasets into a direct related dataset pool and an indirect related dataset pool wherein the direct related dataset pool comprises one or more compare datasets comprising at least one of the one or more shared key fields; transforming, by the data relevancy analyzer, the direct related dataset pool and the core dataset into one or more reduction datasets based on a statistical measure of values of the one or more target data fields, the one or more shared key fields and the one or more compare data fields; creating, by the data relevancy analyzer, one or more target correlation of the one or more reduction datasets based on one or more reduction compare data fields and one or more reduction target data fields; processing, by the data relevancy analyzer, the indirect related dataset pool such that a plurality of datasets comprising the direct related dataset pool are processed as a next core dataset and the indirect related dataset pool is processed as the one or more compare datasets and wherein the one or more core key fields are the one or more reduction compare data fields; creating, by the data relevancy analyzer, one or more statistical relationship strength of the core dataset and the direct related dataset pool based on a statistical mean of the one or more target correlation of the one or more reduction datasets; and creating, by the data relevancy analyzer, a relevancy data store wherein the relevancy data store comprises the one or more statistical relationship strength, the one or more target correlation, the one or more compare data fields and the one or more shared key fields associated with the core dataset and the direct related dataset pool.