How to write a conclusion for an essay?

A conclusion provides a thoughtful end to a piece of writing; it wraps up all the main points, and leaves the reader with something to think about. A conclusion can be a few sentences or a paragraph, but it should always be succinct.
When writing a conclusion, you should always:
Restate the main points of your essay
Summarize your argument
Leave the reader with something to think about
Here are a some example of conclusions:
In conclusion, while there are some disadvantages to using technology in the classroom, the advantages outweigh them. Technology can help teachers customize their lessons to meet the needs of their students, it can help students learn at their own pace, and it can make learning more fun. By using technology in the classroom, we can help students become better learners and better prepare them for the future.