Haystack AI is an open-source AI framework for building production-grade NLP applications including conversational search, question answering, document retrieval, and RAG pipelines. It provides modular components — document stores, retrievers, readers, generators, and pipelines — that can be composed into sophisticated AI search and language processing systems. Enterprise AI teams and NLP researchers use Haystack to build custom AI search experiences, document intelligence applications, and conversational interfaces over large document collections with full control over the architecture and deployment.