What is an imperative sentence?

When gatsby was in europe after world war i and circumstances forced daisy and him to face unpleasant realities about their relationship,

For this assignment, you will create a multimedia presentation in response to the following prompt: research suggests that laughter improves people’s emotional and physical well-being. create a multimedia presentation to inform the audience about the positive effects of laughter on emotional and physical health.

If you receive an email then this doesn’t apply what does this mean?