Click on the following links. Please note these will open in a new window.

Link 1: https://www.youtube.com/watch?v=Ggnfh2RFGP4
This video demonstrates an effective speech introduction.

Link 2: https://www.youtube.com/watch?v=4xTqFRqonR0&list=PLYOcptb7-eyxCdkwPje-p6jjSTwApME8R&index=26
This video explains the uses of a conclusion as well as an effective utilization of it within a presentation.