Why should conclusions not introduce new information?

Conclusions serve to summarize and reinforce the main points presented in an essay or piece of writing. When new information is introduced in the conclusion, it can confuse the reader because they may not have the context or explanation necessary to fully understand this new material. A conclusion should provide closure and reflect on the arguments previously made rather than complicate them with additional information. This consistency aids in reinforcing the overall message and allows the reader to leave with a clear understanding of the main ideas. By sticking to the material already discussed, the conclusion effectively ties everything together, emphasizing the key takeaways without introducing ambiguity or misunderstanding.