Introduction is the paragraph(s) that starts a text, conclusion is the paragraph(s) that ends a text.
The youthful...: Introduction
Conclusion.
a introduction ....... conclusion
Introduction is to conclusion as greeting is to a goodbye.
The paragraph(s) between the introduction and conclusion are called body paragraph(s).
introduction that provides background for the reader
That would be 'introduction'.
Rejoin
Rejoin
The conclusion must mean the same as the introduction but cannot be exactly the same
Introduction
introduction,description, conclusion