Monica is a versatile GPT-4 AI assistant that can help you with a wide range of tasks, including searching, reading, writing, translating, and drawing. It supports multiple chatbots, such as GPT 3.5, GPT 4, Bard, and Claude, allows quick access to saved prompt libraries, provides real-time internet information access, and supports voice input. Monica can also chat and summarize PDFs, answer questions based on uploaded images, and offers features like webpage and YouTube video summarization. It can also act as a search assistant, providing enhanced search results, and offers functionalities like quick customized writing, automatic email replies, text translation, art creation, and an AI knowledge base.