LangChain: Building Blocks for LLM Applications
LangChain is a framework for developing applications powered by language models. It provides:
- Composable Components: Modular abstractions for working with LLMs
- Off-the-shelf Chains: Pre-built assemblies for common tasks
- LCEL: LangChain Expression Language for building custom chains
Why Use LangChain?
| Without LangChain | With LangChain |
|---|---|
| Manual API calls to each provider | Unified interface for all LLMs |
| Custom prompt management | PromptTemplates with variables |
| DIY memory implementation | Built-in conversation memory |
| Manual RAG pipeline | Vector stores + retrievers |