Google Gemini is a family of large language models developed by Google DeepMind that are natively multimodal, designed to understand and generate text, images, audio, video, and code. Gemini powers Google's AI services through both the Gemini API (for developers via Google AI Studio) and Vertex AI (for enterprise on Google Cloud Platform), with models ranging from ultra-fast Flash variants to the reasoning-intensive Pro and Deep Think modes. The key differentiator is Gemini's 1 million+ token context window and deep integration with Google Search for real-time grounding, making it particularly effective for complex reasoning, agentic workflows, and production applications that require both multimodal understanding and massive context processing.