"Take your photos, documents and videos wherever you go."
When you have various computers, it is a good idea to have a storage place where you can save all those files you want to share among your machines, to be able to download them wherever you are. Dropbox is precisely that, a file cloud storage, which you can access whenever you want to upload or download your own files and folders.
With Dropbox you have up to 2GB of storage available, totally for free, so that you can save your videos, photos, documents and/or folders, and download them wherever you want. But that's not all, because the Dropbox system also works offline, and if you have to synchronize various files that have been modified, you just transfer the part of the file that's changed.
Why carry your files around in a pendrive or other portable storage device, when you have other systems like Dropbox? Try it, you won't regret it.