The “Cloud” is software that is installed on a remote server somewhere in the world and you access via the internet. This is a shift from the past when you would purchase a piece of software and install it on a particular machine, and then access that software only from that machine at that particular location.
The Cloud allows access that same piece of software from any computer or device with an internet connection, opening up a whole new world in terms of productivity alone. Many of us are already using cloud-based software. Apple’s online storage account, Shutterfly, Dropbox, OneDrive are all examples of widely used cloud-based services.