In computing, multi-touch refers to a touch sensing surface’s (trackpad or touchscreen) ability to recognize the presence of two or more points of contact with the surface. This plural-point awareness is often used to implement advanced functionality such as pinch to zoom or activating predefined programs.
The iPad uses touchscreen technology. When you swipe your finger across the iPad’s touchscreen or tap it, you’re providing input to the device. You use the pads of your fingertips (not your fingernails) to touch the screen and command the iPad to do something.
For an easy tutorial showing how you can move around an ipad with different gestures visit: http://www.dummies.com/how-to/content/how-to-use-ipad-2s-touchscreen.html