what's the difference between haystack/huggingface/langchain?

[glyh]

I'm farely new to LLM, so please forgive me if my questions sound stupid.

[anakin87]

Hello, @glyh!

• Hugging Face is a company that develops tools for building applications using machine learning. It is most notable for its open-source transformers library built for natural language processing applications and its platform that allows users to share machine learning models and datasets.
  In the context of LLMs, in the Hugging Face Hub, you can find many freely usable Large Language Models.

• Haystack and LangChain are two LLM orchestration frameworks, that you can use to build complete applications based on LLMs.
  Using Haystack, you can easily connect components (Models, Vector DBs, File Converters) to Pipelines or Agents that can interact with your data. Common use cases: RAG, question answering, semantic search and conversational agents.
  To better understand what you can achieve with Haystack, have a look at this overview.