The Signal: Google has introduced an "AI mode" to its search interface, fundamentally shifting the experience from keyword-based lookups to a conversational, chat-like flow. While the company positions this as the most significant search upgrade in 25 years, the traditional search button and Enter key remain fully functional for users who prefer the past. The central tension lies in the transition from a passive library-like utility to an agentic assistant that can analyze files, generate visuals, and, eventually, perform tasks like making business calls.