There a quite some movie genres and sub-genres. We would like to make it as simple as possible:
Action movie: bulk of the content must be action-oriented, including fight scenes, stunts, car chases, and general danger. Sub-categories include "Military", "Espionage" (James Bond), "Wuxia" (Hero), "Adventure", "Superhero" (Avengers), etc.
Animation movie: inanimate objects being manipulated to appear as though they are living.
Comedy movie: defined by intended to make someone laugh. A sitcom (situational comedy) is defined by a set group of people who must navigate through humorous situations and misunderstandings.
Crime movie: deals with both sides of the criminal justice system but does not focus on legislative matters or civil suits and legal actions.
Drama movie: defined by conflict and often looks to reality rather than sensationalism. Emotions and intense situations are the focus.
Fantasy movie: defined by both circumstance and setting inside a fictional universe with an unrealistic set of natural laws, such as "Harry Potter" and "The Lord of the Rings".
Historical movie: can be split into two sections. One deals with accurate representations of historical accounts; the other section is made up of fictional movies that are placed inside an accurate depiction of a historical setting.
Horror movie: centered upon depicting terrifying or macabre events for the sake of entertainment, such as movies related to ghost, monster, vampire, zombie, etc.
Romance movie: defined by intimate relationships.
Science Fiction movie (Sci-Fi): defined by a mixture of speculation and science. While fantasy will explain through or make use of magic and mysticism, science fiction will use the changes and trajectory of technology and science.
Thriller movie: mostly about the emotional purpose, which is to elicit strong emotions, mostly dealing with generating suspense and anxiety, including Psychological and Mystery movies.
Western movie: defined by their setting and time period. The story needs to take place in the American West, which begins as far east as Missouri and extends to the Pacific ocean. They’re set during the 19th century, and will often feature horse riding, military expansion, etc.