You can share files with anyone, including people without Dropbox accounts, by sharing a link to any file or folder. You can send a shared link by email, Facebook, Twitter, instant message, social networks, wherever you want. Learn how to manage your default sharing settings.
Dropbox Professional, Standard, Advanced, and Enterprise customers can also add passwords and expirations to shared links.
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Sharing using shared folders
If you need to collaborate with someone on multiple files, you can create a shared folder. Each member of a shared folder needs a Dropbox account in order for any changes to sync.