Netflix brings along a new partial downloads feature to enable users to watch shows and movies before the download is fully completed. This feature is useful for users who travel often and download content on-the-go. This cushions the disappointment of discovering that a download didn’t complete due to broken network.

source https://gadgets.ndtv.com/entertainment/news/netflix-partial-downloads-feature-rollout-announced-android-phone-tablets-ios-coming-months-2474890#rss-gadgets-all