A professional services firm has deployed Microsoft 365 Copilot. Consultants report that when they ask Copilot to summarize their recent client work or find relevant documents from past projects, it delivers accurate, personalized results drawing on their emails, Teams chats, SharePoint files, and calendar. The firm's AI leader wants to explain to executives which underlying component enables Copilot to reason over this interconnected organizational content while respecting each user's existing access permissions. Which component should the leader identify?