Summarize the key points

Most presenters either make an argument (i.e., they want to persuade their audience to accept their point of view) or give fresh or fascinating information (i.e. they want to educate their audience). In either scenario, the presentation will most likely include crucial information and figures. The conclusion provides you with the opportunity to emphasize the most significant information to your audience.

This does not suggest that you should just repeat everything from your presentation a second time. Instead, choose the most relevant sections of your presentation and succinctly summarize them.

This is comparable to what you may find in the final paragraph of an academic essay. If you're presenting a business proposal to potential investors, you might end with a description of your company and the reasons why your audience should invest in your idea.