Unlike the "Online" or "Light" versions (which require an active internet connection to download drivers on-the-fly), the contains everything locally. You burn it to a DVD or write it to a USB drive, boot into Windows, and run the executable.
The Offline ISO is designed for computers that do not have internet access or have missing network drivers (Wi-Fi/Ethernet). It contains the entire driver database locally, so no download is required during the installation process. driverpack 14 offline iso