Slide Away: what's the difference between 'speaking' and 'presenting'?

Unless we’re at work or school, we generally don't use PowerPoint for communicating about the big issues in life.

We sit down with people, face to face, and speak

So why don't we do that with other big issues - in our professional lives? With clients, customers, and stakeholders?

In those situations, we don't speak; we 'present'

I find that most people see 'presenting' as different to 'speaking'.