♦ What is used when the speaker does not refer to a known number or possibility, so it can be said that “what” is more open-ended and general.
〉What types of films do you like?
〉What car will you buy?
〉What is the best part of this job?
〉What is the most unusual problem, you have had to deal with?
Which is used to ask for a limited number of items and a specific choice.
〉Which shoes should I wear for interviews? Black or brown ones?
〉Which way is the wind blowing?
〉Which books should I read to improve my English?
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