What is the name of the part of a paragraph that summarizes the main idea and often provides a closing thought?

The correct answer is: Conclusion. 

Paragraph: 
- A paragraph is a group of related sentences that are focused on a single main idea or topic. It is a unit of writing that contains a clear beginning, middle, and end, and is often used as a way to organize information and convey ideas in a logical and structured manner.

Conclusion of a paragraph: 
- The conclusion is the final part of a paragraph and summarizes the main idea or argument presented in the paragraph.
- It often provides a closing thought or idea and may offer suggestions for further exploration or action.