Gmail is undergoing its most significant transformation in 20 years, integrating Google's Gemini AI to become an AI-first communication platform. The update, rolling out to some US users, introduces features like AI Overviews to summarize long email threads and enhanced natural language search. Google aims to address inbox overload by using AI to prioritize urgent emails, draft responses, and help users manage their inbox more proactively. This shift positions Gmail as an intelligent assistant rather than just an email client.