LangChain

What is it?

LangChain is an orchestration framework (a coding library) that simplifies the development of applications powered by Language Models.

Building an AI app involves many raw components: prompts, models, output parsers, retrievers, and memory. LangChain provides the “glue” code (abstractions) to chain these components together into complex workflows, making it easier to build Chatbots, RAG systems, and Agents.

Why is it Important?

• Abstraction: It hides the complexity of different model APIs (OpenAI, Anthropic, HuggingFace) behind a standardized interface.
• Chaining: It allows developers to create sequences of calls (e.g., “Take user input” -> “Search Wikipedia” -> “Summarize result” -> “Email summary”).
• Tooling Ecosystem: It comes pre-packaged with hundreds of integrations (loaders for PDF, CSV, Youtube) and ready-made algorithms for chunking text and managing memory.

Technical View

The core concept is the “Chain” or “Graph” (via LangGraph) that pipelines data flow.