This is a version of an original source (such as a diary, an autobiography, or a story) which is modified for presentation in another form, such as a film, a musical, or a play.

ADAPTATION, this is a version of an original source (such as a diary, an autobiography, or a story) which is modified for a presentation in another form, such as a film, a musical, or a play

Explanation:

Adaption simply means to create a work of art (usually literary) from the basic elements found in an earlier work, but in a different medium this time, leading to the production of a secondary work. Film, musical work or plays have been adapted in different forms since the 20th century.  

We have faithful adaptation – in which the core elements in the original works are retained in so far as the secondary work to be created permits that.

In free adaptation – unlike faithful adaptation, the core basics of the original work are not retained and in some cases, fully replaced by an entirely new material.