The "cloud" is a remote server that is connected to the internet that can be accessed from anywhere, anytime. It can store digital information ranging from music and photos to important documents and even your sync calendar. If your computer were to crash and you did not have some sort of backup system, you could lose all of those files. Imagine how horrible it would be if you lost years worth of precious memories because you could not recover your photos. You can use the cloud to connect all of your mobile devices as well. I am so grateful that I have a cloud backup system. My iPhone was having problems a while back and I had to reset it to factory settings. Thankfully everything was stored on the cloud and therefore, when I accessed it, all of my files and contacts and photographs were immediately restored. It even placed all of my apps back to exactly where I had them.