Please note: New Dropbox accounts created after October 4, 2012 no longer have a Public folder. Don't worry! Every account created prior to this date will still have a Public folder. If you would like to enable a Public folder on a new account, see the instructions below (Creating a Public folder).
However, all the extra functionality provided by the Public folder is now accessible anywhere in your Dropbox. Now all you need to do to share and preview files and folders in your Dropbox is select Share link via your computers, phones, and tablets. Take a look at Dropbox links here or go to this article to see how it works.
Create links to files and folders in your Dropbox by dragging and dropping them into the Public folder. Your friends and colleagues can choose to download the file or view it in their browser, and any edits they make will not affect the original version. If you make any changes to the file, however, your edits will be updated within the link. You can also send the links to anyone by pasting them into your emails, instant messages, and web pages.
First, you'll have to make the file available to anyone by moving the file you want to share to the Public folder located in your Dropbox.
Once you’ve uploaded or moved the file to your Public folder, click on the icon of the file to select it. In the blue bar at the top of the window, click Copy public link from the resulting menu.
If you have the Dropbox application installed on your computer: once the file is in your Public folder, simply right-click it and choose Copy public link from the menu.
If you're done sharing the file or folder, move the file out of the Public folder either by dragging and dropping the file elsewhere (on your desktop and on the web) or selecting the file and pressing Move from the blue bar at the top of the file browser. Any future visitors to the public link will receive an error informing them that the file is no longer available.
Renaming a file will also remove a public link. If you need to rename a file, simply create a new public link to resume sharing it.
Now you have the basics down, here are some advanced topics on public links:
Dropbox links give you everything you need to share and preview files and folders. However, if you’re just a diehard fan of Public folders, click here to enable one on your account.
You should only use shared folders, public links, and photo galleries for files that you have the legal right to share with others (for example, documents, photos, software, music, and videos that you personally created). You do not have the right to share files unless you own the copyright in them or have been given permission by the copyright owner to share them. Purchasing or legally acquiring video, music, ebooks, or software does not give you the right to share that material with third parties over the Internet.
If you have any doubts about whether you have the legal right to share certain files, you should not share them. By using the shared folder, public folder, or photo galleries features you represent that files placed in those folders do not violate Dropbox’s Terms of Service and that you own all copyrights to them or have been given permission by the copyright owner to share them. Dropbox has adopted a policy of terminating the accounts of users who repeatedly infringe copyright or whose accounts are subject to multiple infringement allegations. If you repeatedly share files that infringe others’ copyrights, your account will be terminated.
For more information on Dropbox’s copyright policy, please visit Dropbox’s DMCA page.