Prose craft
Omniscient narrator
A third-person narrator with an overarching perspective who knows all events and what every character thinks and feels.
An omniscient narrator is a third-person narrator "presented by a narrator with an overarching perspective": one consistent storyteller who sees every event in the story world and knows "what each of the characters is thinking and feeling," free to move between minds, to report scenes no character witnesses, and to comment from above the story. The style was typical of 19th-century fiction; Dickens, Tolstoy and George Eliot are the standard examples.
The distinction that matters in practice: omniscience is a consistent voice making deliberate moves, while an unmarked mid-scene jump between minds is a slip, the head-hopping problem. A true omniscient narrator often borrows a character's diction in passing, which is free indirect discourse working inside the larger view.