"Where did you buy it?" or "where did you buy it from?"
When someone purchase something from somewhere and I ask him the location of purchasing, which one is the correct question:
Where did you buy it?
OR
Where did you buy it from?
Is preposition necessary to use in this question or there is no need to use it?
Where did you buy it? Omitting "from" from the question, does not change the question.
Where did you buy it from?
Addition of "from" - should be to indicate "asking about a specified place".
They are both correct and have a similar, if not identical, meaning. They both inquire the location of purchase.