What is LangChain?

Created in 2022 by Harrison Chase, LangChain is an open-source Python framework for building LLM-powered applications. It provides developers with modular, easy-to-use components for connecting language models with external data sources and services. The project has attracted millions in venture capital funding from the likes of Sequoia Capital and Benchmark, who supplied funding to Apple, Cisco, Google, WeWork, Dropbox, and many other successful companies.

LangChain simplifies the development of sophisticated LLM applications by providing reusable components and pre-assembled chains. Its modular architecture abstracts access to LLMs and external services into a unified interface. Developers can combine these building blocks to carry out complex workflows.

Building impactful LLM apps involves challenges like prompt engineering, bias mitigation, productionizing, and integrating external data. LangChain reduces this learning curve through its abstractions...