That day, I was presenting PKI to people who do not know anything about cryptography, yet I wanted to sell them the PKI service. So i prepared a presentation that shows from logical and business perspective why we need PKI and how it works.
You can download the PowerPoint presentation here: PKI_Overview
Note: The presentation contains notes for each slide, so it can help you figure out what each slide is talking about.
Please watch this presentation video online also :