A memoir (from French: mémoire: memoria, meaning memory or reminiscence) is a collection of memories that an individual writes about moments or events, both public or private, that took place in the subject's life. The assertions made in the work are understood to be factual. [source]
It is wonderful that they have finally made a screen adaptation of the memoir. However, your focus is on the book not the movie. Don't watch the movie unless you have read the book as both mediums have a different objective, audience and focus.
Robyn Davidson (born 6 September 1950) is an Australian writer best known for her book Tracks, about her 1,700-mile trek across the deserts of west Australia using camels. Her career of travelling and writing about her travels has spanned over 30 years. [source]