Microsoft Graph provides one unified API to search all content ... Searching across SharePoint, Outlook, and OneDrive gives you unified access to perhaps your company’s largest knowledge base ...

While Office Graph still exists, those involved with the two technologies describe Office Graph as "the brain" of Graph. Graph, the technology formerly known as the Office 365 Unified API ...

Using the Graph API to work with Excel is relatively easy; it’s a set of REST APIs with a common structure for all calls. This lets you quickly build URLs that access OneDrive locations ...