Grok, an AI chatbot created by Elon Musk's xAI, is now available as a standalone app in the United States. Initially integrated into the X (Twitter) platform, Grok is noted for its casual and humorous style compared to competitors like ChatGPT. The app features Grok 2, with capabilities such as image generation and real-time information retrieval, and is now accessible on iOS and as a web app.