Research is necessary for any type of writing - for accuracy; for color; in order to fully investigate the topic at hand; in order to understand the professional field and context one is operating in.
This tag is for all questions about how to conduct research for writing, and how to use that research in the writing itself.
Please note that specific research questions ("I'm writing about [X], does anybody know [detail about X]?") may be considered off topic (see: Is it appropriate to ask questions on specialist knowledge areas? ). Such questions are best answered by people knowledgeable in that particular topic, or communities devoted to such questions, such as Detail Oriented. At best, questions about identifying appropriate resources may be on-topic.