LangChain Interview Questions for Freshers

LangChain is an open-source framework for building applications powered by LLMs. It solves the problem of connecting LLMs to external data, tools, and memory. Without LangChain, you write boilerplate for every: prompt formatting, chain-of-thought parsing, tool calling, memory management, and streaming. LangChain provides standardized abstractions so you can swap models (GPT-4 → Gemini) without rewriting business logic.