How do I write an executive summary in a business plan?

I have to do a business plan as an assignment and every part of this plan is giving me trouble, but the executive summary the most. So if someone could help me by telling what exactly I should put in it, the format of it and how long it should be that would be great. Thank you so much!
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Bplans.com has a good site explaining the Executive Summary section of a business plan. They even have some sample executive summaries that you can check