JIn grammar, parallelism, also known as parallel structure or parallelconstruction, is a balance within one or more sentences of similar phrases or clauses that have the same grammatical structure.ParallelStructureParallelstructure means using the same pattern of words to show that two or more ideas have the same level of importance. This can happen at the word, phrase, or clause level. The usual way to join parallelstructures is with the use of coordinating conjunctions such as "and" or "or.".