Questions such as this one show a gross lack of even basic research. (My answer to the question is in fact an almost straight explanation of Google's first result.)
So far, I tend to answer these questions (here and on other stackexchange sites) and point to the appropriate resources. However, many members simply downvote with a "RTFM" / "Google it" comment instead.
Should these questions be answered or should they be flagged and removed from the site?
The consensus seems to be that Yes, questions with almost no research should still be answered. This is because the gamedev SE site is designed to be a comprehensive and authoritative source of answers on the topic of game development.
As an addendum, it probably wouldn't hurt to let the question's author know that his question was trivially answerable with a modicum of research, and point them in the direction of the following resources, in order to drive the quality of the questions and answers up: