What the research says
Copilot selects information by grounding responses in sources available for the prompt and account context. When web search is enabled, Copilot generates a short Bing query, uses public web results to improve the answer, and can show the exact query plus sources behind the response. For public brand visibility, the practical work is to make pages retrievable through web search, answer the prompt clearly, and provide source-backed proof Copilot can summarize. In work or school accounts, Copilot may also ground responses in Microsoft 365 content the user is authorized to access.