However, there are other strong contenders for the prize, including South Korean social satire "Parasite" and sentimental Hollywood favorite "Once Upon a Time in Hollywood" from Quentin Tarantino. The movie has been drawing enormous attention worldwide after being nominated and also winning some major titles.
Joaquin Phoenix won his first Oscar, for best actor, for playing a failing clown who finds fame in violence in the dark comic-book tale "Joker", and gave an impassioned speech about climate change and animal rights.
The Academy of Motion Picture Arts and Sciences this year changed the name of the worldwide feature film category to reflect a more positive and inclusive approach to films shot outside of Hollywood.
There was a round of applause for the cast and crew of the film too.
In the 90-year history, only one woman has won the award for Best Director.
At the 2019 Golden Globes, the Lucy in the Sky star presented the best director award alongside Ron Howard and said, "And here are the all-male nominees". "I didn't understand why there was a rap category and best album category and I couldn't understand why rap album cannot be in the best album category".
Oscar night, broadcast from Los Angeles' Dolby Theatre, will not have a host for the second year in a row.
Idina Menzel was another highlight of the night, trying her very best to get into the performance of "Lose Yourself". Five-time Grammy victor and upcoming James Bond singer Billie Eilish will also perform.