iTunes by Apple Inc. is a media player and a library, as well as an internet radio broadcaster, file manager, and a store where users can browse and buy different types of apps and entertainment products like movies and songs.
YouTube Movies & Shows is the video-on-demand platform of YouTube which offers some of the latest films and TV series, as well as the classics. Although most of the content is offered with price, some can be watched for free with ads.
Google Play Movies & TV is an on-demand video service operated by Google. It allows you to rent or purchase movies and series directly on your device for watching them offline. It has a large library and offers both SD and HD quality.
Amazon Prime Video is an internet video-on-demand service where users can watch exclusive Amazon Originals as well as popular movies and TV shows anytime, anywhere. The service contents are either for rent or purchase.