GPTZero is an AI detection tool that helps users identify content written by AI models like ChatGPT, GPT4, Bard, and LLaMa. It offers various products and solutions for teachers, students, and writers, including a Chrome extension called Origin that scans for AI content while browsing the internet, a Writing Report feature that provides statistics and analysis of writing in Google Docs, and an API for integrating AI detection into other tools. GPTZero aims to bring transparency to the use of AI-generated content and promote trust between humans and AI.