The Lord of the Rings: The Rings of Power Ep. 6: Confronting Miriel's Fate (According to Tolkien)
Taken from the elvish word Palantíri (meaning far-seeing), the Palantír that we see in Rings of Power is one of eight seeing stones (seven on Middle-earth). In the shortest, most reductive terms, it is basically used as a crystal ball in the series. In other Lord of the Rings stories, they are used for both communication and intelligence gathering.