not all the time
The title of a book or movie is always separated from the main text by italics. In some cases the title will also be in quotation marks.
No. It should be in italics like a book title. You can indicate italics by underlining.
Normally the titles of movie, poem, musical composition are written in italics
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Italics
On the computer it is in italics but when you are writing it you underline it quotes are for a specific scene in the movie
Titles of books, movies, TV shows, and other standalone works are typically written in italics.
It is more common in journalism to use italics for the title of a newspaper. This helps differentiate the title from the rest of the text and conforms to AP style guidelines.
To be gramatically correct, yes. You do italicize the title of a movie. (As well as books.) But if you're using something that can't use italics (such as a typewriter), you're supposed to underline it.
For titles of films, use italics to show the title is a standalone work. If italics are not possible (such as in handwriting), underline the title instead.
It is correct to either use italics or to underline. Be consistent throughout your essay, however.
To properly cite a movie in text, include the title of the movie in italics followed by the year of release in parentheses. For example, "The Shawshank Redemption (1994)."