This tag is used for questions that ask users to — what else? — discuss an idea, concept, or problem. Common use cases include hashing out how the community should handle a certain action and collaborating on how to solve a perceived issue within the community. A discussion question may not necessarily have a clear-cut right or wrong answer and is often subjective.
discussion is one of the four possible mandatory tags. The other mandatory tag options are feature-request, support and bug.