Dropbox is a cloud storage and file synchronization service. It allows you to backup and sync photos, videos and files to cloud storage and access them from any computer, smartphone or tablet. To sync Dropbox files between computers, you need to download and install 'Dropbox Desktop Application' on your computer and sign in using the same login on all your devices. When you download and install Dropbox on your computer it creates a special folder (Dropbox folder) on each computer for storing the photos, videos and files. Changes made to one Dropbox folder (on your computer) will reflect in other Dropbox folders (on other computers) as well. This is done via Dropbox automatic sync. When you sync the file to your Dropbox account, you can open it from any other computer, smartphone or tablet. Dropbox has a 'Shared folder' feature, which allows you to share the folder with family and friends.