わざわざ is an adverb meaning “taking the trouble to,” “specially,” or “expressly.” It highlights that someone makes a special effort, goes out of their way, or does something that was not strictly necessary. Its position is flexible: it often appears before the verb or predicate, but it can also occur elsewhere in the clause, such as before a beneficiary or object phrase. Depending on context and intonation, it can express appreciation, mild surprise, or criticism about unnecessary effort. It can be used in both familiar and polite sentences without changing form.