Microsoft SkyDrive and SkyDrive Pro
There are two versions of SkyDrive: SkyDrive and SkyDrive Pro.
SkyDrive is an online (cloud) storage area you can use as your own personal online hard drive. It is geared toward consumers and ordinary home users. When you create a document with one of the Office Web Apps, it will be saved to your SkyDrive. You can store other files there too, such as photos. Both SkyDrive and Office Web Apps are located in the cloud, so they can be accessed with any device that has an Internet connection.