The third person passive voice is a grammatical construction where the subject of the sentence receives the action rather than performing it. In this voice, the subject is acted upon by the verb without specifically stating who is performing the action.
In the third person, the subject is usually either ‘he’, ‘she’, ‘it’, or ‘they’. For example, in the sentence ‘The book was read by her’, ‘The book’ is the subject receiving the action of reading. The focus is on the action being done to the subject, rather than who is doing it.
Passive voice can be useful when the doer of the action is unknown, irrelevant, or simply needs to be less prominent. It shifts the focus to the action and the recipient instead of the performer.