An adaptation is a transfer of a work of art from one style, culture or medium to another.
Some common examples are:
Film adaptation, a story from another work, adapted into a film (it may be a novel, non-fiction like journalism, autobiography, comic books, scriptures, plays or historical sources).
Television adaptation, a story from another worked, adapted into a over-the-air, cable or streaming television series.
Literary adaptation, a story from a literary source, adapted into another work. A novelization is a story from another work, adapted into a novel.
Theatrical adaptation, a story from another work, adapted into a play.
Video game adaptation, a story from a video game, adapted into media (e.g. film, anime and manga, and television)
Musical adaptation, a play or a film, adapted from another work, that uses musical numbers as a storytelling device.
Translation of another work
Adaptation studies, an interdisciplinary field within the arts and humanities, examines the process and implications of transforming a work from one medium to another.