Usually people say, "Which is your favourite show?" and "Which color is this?"

But some people also say, "What is your favourite show?" and, "What color is this?"

Can you tell me what is the usage of which and what is the usage of what? Is which only used when we give some choice or not?


I had the same question the other day, it turns out that "Which" and "What" can sometimes be used interchangeably for direct questions.

In school, you learn that you should use "Which" when asking about 2 or more options, and "what" for only one.

In real life, you can use which as what for questions that don't make someone choose between options.


When you have a number of choices you should use which and it is formal, but you can also use what in its place but it sounds less formal.

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