Parallelism is a literary and rhetorical device that involves using similar structures in sentences or phrases to create rhythm and clarity. This technique helps to emphasize ideas and make them more memorable. For example, in the phrase "I came, I saw, I conquered," the repetition of the structure enhances the impact of the message. In addition to literature, parallelism is also used in various fields, including music and programming. In music, parallelism can create harmony through similar melodic lines, while in programming, it refers to executing multiple processes simultaneously to improve efficiency.