Voiceover is a production technique where a voice—that is not part of the narrative —is used in a radio, television production, filmmaking, theatre, or other presentations. The voiceover is read from a script and may be spoken by someone who appears elsewhere in the production or by a specialist voice actor.
Proofreading is the most basic, straight forward "editing" of an existing text, eliminating mistakes.
This covers includes:
Copywriting is a content production strategy focused on convincing the reader to take a specific action.
The copywriter must write the “copy” (the content) thinking about its persuasive character, using triggers to arouse interest in the reader, in order to generate conversions and sales.