1. What kind of movies do you like?

Question

2. What kind of movie do you like?
3. What kinds of movies do you like?

Are all the sentences grammatical?
Especially, what about #2? Is #2 the same as #1?

Answer 1

All grammatically correct. No, #1 is not the same as #2. In #1 you ask about movies, plural and #2 you merely ask about one movie. Essentially you could get the same answer.