"He who asks a question is a fool for five minutes; he who does not ask a question remains a fool forever." - Chinese proverb

As educators, encouraging questions from students is a way to gauge student learning, increase student participation, and encourage active learning. Sometimes students are shy or maybe they don't want to appear "uncool" so they don't speak up. Having a Q & A time is valuable before a lesson begins and after it's complete.
Good discussion revolves around the use of open-ended questions. These are questions with a little vagueness that do not prompt or suggest a specific answer from youth. Avoiding yes/no questions (closed-ended) provides a space for discussion and dialogue. Open-ended questions encourage a more thoughtful response. They are helpful in discovering more about a topic and can enhance a lesson.
Examples of Open Ended Questions:
Examples of Closed Ended Questions:
Do you recall Bloom's Taxonomy? In 1956, Benjamin Bloom, published a structure for youth to obtain knowledge. The basic understanding of the structure is that knowledge is gained from simple to complex and concrete to abstract.

Vanderbilt University Center for Teaching (graphic)