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As test case is the important document for testing, testers use different effective techniques for preparing the same. Equivalence Partitioning or equivalence classes is one of the effective techniques among them. It is a black box testing technique, which focusses mainly on the functionality of a software. Therefore the main aim of equivalence partitioning is to prepare an effective test case which covers the total functionality of an application. In this article, I have included a brief note on Equivalence Partitioning.