In grammar, parallelism is a balance of two or more similar words, phrases, or clauses. The application of parallelism in sentence construction improves writing style and readability. Parallelism may also be known as parallel structure or parallel construction. In English, parallelism of the predicate provides for one of the few structural situations in which the subject for each verb does not need restatement (a common misconception for non-native speakers). Parallelism is often achieved in conjunction with other stylistic principles, such as antithesis, anaphora, asyndeton, climax, epistrophe, and symploce


Example
She likes cooking, jogging, and reading
(All of the verbs end with ing)

or
She cooked, jogged and walked

(all the verbs end in ed)