Share Files and Folders
Whereas syncing, which I covered in Sync Files on a Mac or PC, lets you make your own files and folders available across the other devices you use personally, sharing lets you selectively give other people access to items in your Dropbox. Sharing in Dropbox takes three forms, and which one you use on a given occasion depends on your needs:
Sending links: When you send a link to a file or folder (see “Send a Link,” just below), the people who receive the link can download the shared items (or, if they’re Dropbox users, add them to their own Dropbox folders). Once a linked item is downloaded, recipients can do anything with it they like, but they can’t modify or delete the copy in your Dropbox.
Inviting users to a folder: ...