Delve is a Microsoft Graph-based discovery and collaboration tool. Delve uses signal data gathered from the Microsoft 365 platform to inform its decisions about what content that you already have access to might be interesting or useful to you and then suggests that content to you. When you launch Delve (https://delve.office.com), you'll see your profile page showing people in your organization that you communicate with and the files that you've recently worked on that are stored in SharePoint or OneDrive for Business:
Delve can also be used to view people in your organization and see what they're working on. For example, if someone you frequently email uploads a new document to a SharePoint site that you also have access to, you might see a reference to that document being displayed.
It's important to note that Delve is security...