S4B

LlamaIndex is a data framework for connecting LLMs to external data sources. It provides tools for ingesting, indexing, and querying data for RAG applications.

• Data connectors for 160+ sources (files, APIs, databases)
• Advanced indexing strategies (tree, keyword, knowledge graph)
• Query engines with automatic retrieval optimization
• Workflows for complex multi-step RAG pipelines

Used by developers building RAG systems that need to ingest and query complex data (PDFs, databases, APIs). Complementary to LangChain.

Open-source (MIT license). LlamaCloud for managed indexing and parsing.

Visit LlamaIndex official website →