I saw a blog where it shows "written by" and not "wrote by" someone. Anybody please explain why? Is writing wrote by wrong?
James Herbert wrote this book
This sentence uses active voice: the verb is in simple past tense.
this book was written by James Herbert
This sentence uses passive voice. In passive voice, we use the past participle for the verb, regardless of when it happened- even in the future. In this sentence, was indicates that it happened in the past. write is an irregular verb, and the three main forms are
write - base form
wrote - past tense
written - past participle.
You can find more about irregular verbs here.