Semantic Indexing is an AI-driven feature in Windows 11 that enhances search functionality using Natural Language Processing (NLP) to interpret the context and intent behind search queries. It allows users to search for files, settings, and content using conversational language rather than exact keywords. Semantic Indexing is integrated into various components of Windows 11, including File Explorer, the Start menu, and the Taskbar search box. It requires a Neural Processing Unit (NPU) and is available on Copilot+ PCs starting with the May 2025 security update. Users can verify its activation by checking for specific AI components in the settings. The feature supports various file formats such as images and documents and is compatible with several languages, including English and Spanish. The rollout of these enhancements will occur gradually.