Is there a presentation mode on mac?

When watching a video, or making a presentation, is there an option or a tool to disable all screensaving, energy savings and all? Regardless of if the power is plugged, I'd like to keep the screen fully on.

I know I can manually adjust the settings everytime. But is there a "presentation" mode, in addition to "battery" and "power adapter" modes? Or a tool to achieve this?

Thanks

Solution 1:

The best 3rd-party based solution for you is to use Caffeine.

About Caffeine: A tiny program that puts an icon in the right side of your menu bar. Click it to prevent your Mac from automatically going to sleep, dimming the screen or starting screen savers. Click it again to go back. Hold down the Command key while clicking to show the menu.

Solution 2:

Nothing built-in to the OS, but MarcoPolo can be used to do what you want.