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For more information on Open Enrollment dates and other the important events between September and January regarding Part D, see this brochure created by CMS (Centers for Medicare and Medicaid Services).
Are you asking, "What is Plan D?" Here is a brief explanation.
The above video defining Part D was produced by a private insurance company, United Healthcare. By linking to their video, I am not endorsing this insurance company or any other insurance company. I just like their short, clear introduction to Part D. See a SHIP counselor for free, unbiased Medicare counseling.
From year to year, the insurance companies that administer Medicare Part D plans can change prices and policies. For example: