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What Is LangChain?
January 9, 2026 · Katherine Holland · 3 min read
LangChain is an open-source framework built to support applications that use large language models in structured, reliable ways. It focuses on turning raw model outputs into systems that can search data, use tools, and follow multi-step logic. Language models are powerful on their own, but real products rarely rely on a single prompt and a single answer. Most useful systems need memory, access to files or databases, and the ability to perform actions such as calculations or API calls. LangChain was created to organize those needs into a clear development framework.
