LangChain

In a nutshell, LangChain connects the industry popular Large Language Models such as OpenAI and HuggingFace Hub, to few external sources like external files, Database, Google, Wikipedia and Wolfram. 

It provides abstractions (chains and agents) and tools (prompt templates, memory, document loaders, output parsers) 

The core objective of Langchain, is to orchestrate LLM workflow/pipeline by interfacing between text input and output. 

Ref: https://python.langchain.com/