1. The last paragraph of a five paragraph essay is the conclusion. This is where you'll do three things:
1. Restate your thesis statement
2. Summarize the subpoints of the three body paragraphs
3. Tie it all together to make one complete and effective essay
If your essay has a weak conclusion, the entire piece falls apart. It's like watching an exciting movie for two hours, only to have it run out of steam and lose your interest in the last 10 minutes. What a waste of time! Let your readers get the most out of your essay by giving your paper an interesting and well-constructed conclusion.
Here's a helpful link: http://www.time4writing.com/uncategorized/writing-a-good-conclusion-paragraph/