Delve helps you discover the information that's likely to be most interesting to you right now - across Office 365. You don't have to remember the title of a document or where it's stored. Delve shows you documents no matter where they're stored in OneDrive for Business or in Sites in Office 365.
Delve also lets you view your colleagues' profiles, or edit your own. Your profile is like an electronic business card you share inside your organization.
Delve never changes any permissions, so you'll only see documents that you already have access to. Other people will not see your private documents.