The Fluid Interface recognizes the devices that are used to access it. Objects and data will be maximized to look best on that device, whether it is a laptop, a PC or a Smartphone. It is built to enhance the user experience by being both adaptive and responsive.
The elements on the page are moved (made smaller, moved closer together, etc.) to make sure it is displayed to maximum effect on the current device. This is adaptability.
Once the device is detected, the fluid interface becomes responsive by allowing the user to use device-appropriate actions such as swiping, pinching and scrolling in the same way as other applications on the device.