We love Keynote — Apple's own presentation software. The application makes it possible to create incredible presentations with very little effort.
Mac users can easily take a “print screen”, which means saving a copy of what's on your Mac's screen at the moment. This copy will be saved as an image on your desktop. It's a great way of sharing what exactly you're seeing on your Mac's screen.
Keynote is Apple's own presentation application. Like PowerPoint, it allows you to put on impressive presentations, but faster and with better end results.
If you keep your Mac in a public place like an office or a university, you should definitely add a password to your screensaver. It only takes a minute!