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.
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. Files in shared folders sync between members’ Dropbox accounts, so each member of a shared folder needs a Dropbox account.