LangChain

LangChain is a framework for developing applications powered by large language models (LLMs). It provides tools and abstractions to connect LLMs with external data sources, APIs, and tools, enabling complex AI workflows. Key features include LLM integration with OpenAI, Anthropic, Google, and others, prompt templates and management, chains for sequencing LLM calls, agents that can use tools and make decisions, memory systems for conversational context, document loaders for various file types, vector store integrations for semantic search, evaluation and debugging tools, and production deployment support. LangChain is widely used for building chatbots, document analysis systems, automated workflows, research assistants, and RAG (Retrieval Augmented Generation) applications.