This tutorial guides you through building a document analysis application using Flask, LangChain, Cohere AI, and SendGrid. The application receives PDF documents, extracts text, creates embeddings, and uses these to answer user queries via email. The combination of these technologies provides a robust system for analyzing documents and sharing results via email. The tutorial covers the setup of the development environment, creating the Flask application, and implementing the necessary functions for document analysis and query processing. It also includes testing the application using Postman and sending emails with the results to users. The solution serves as a starting point for building more sophisticated document analysis applications that leverage machine learning and natural language processing capabilities.