DropBox

Dropbox is software that syncs your files online and across your computers. Put your files into your Dropbox folder on one computer, and they'll automatically appear on any of your other computers that also have Dropbox installed (Windows, Mac, and Linux too!). You can even download Dropbox apps for your smartphone or mobile device (iPhone, iPad, Android, and Blackberry). Everything in your Dropbox is available from the Dropbox website, too. 

Dropbox lets you share files easily, You can easily share entire folders or photo albums with Dropbox. Simply put the folders you want to share in your Dropbox, and invite people to them. You can also send people links to specific files within your Dropbox. This makes Dropbox perfect for team projects. 

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https://www.dropbox.com/