The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
Entangle two or more iOS devices and view their albums together. You can browse photos from each device on both devices at the same time and what you see on one device is reflected on the other. It is a fun way to view photos with friends.