Just like Gmail and Facebook, Dropbox has enabled 2-step sign-in verification for their website and any new apps that you give permission to access your Dropbox account. The step is vital if you are storing sensitive and private information in your Dropbox. You never know what could happen so you might as well be prepared.

To activate 2-step verification in Dropbox, signin to your account in a browser, click your username at the top right, and then select the Security tab. At the very bottom there should be an option to enable 2-step verification.