Hello @Lalit Mohan Sahoo ,
Users receive personalized and relevant search results via the Microsoft Graph, which scans and analyzes data across various Microsoft 365 apps within your organization. These results are tailored based on your connections and interactions with content and people in your network. Microsoft
Copilot employs the semantic index, an enhanced feature of Microsoft 365 search, ensuring secure and policy-compliant searches. This semantic index enhances search and Copilot experiences while prioritizing user security, only displaying accessible content. Learn more: [link]"https://learn.microsoft.com/en-us/MicrosoftSearch/semantic-index-for-copilot