// about LlamaIndex
LlamaIndex is an open-source data framework for connecting large language models to external data sources — databases, PDFs, APIs, Notion, Slack — to build retrieval-augmented generation (RAG) applications and AI agents that reason over private data. It handles ingestion, indexing, querying, and response synthesis, abstracting the complex engineering behind production-grade RAG. Developers building document Q&A, knowledge bases, and enterprise AI assistants use LlamaIndex as the data layer.