RAG Explained 2026 | Retrieval-Augmented Generation, AI Hallucinations, Semantic Search & Vector DB

Why does AI hallucinate? Learn how RAG uses retrieval, semantic search and vector databases to ground LLM answers in current, verifiable information. Understand why generative AI can produce confident but incorrect answers and how Retrieval-Augmented Generation (RAG), grounding, source retrieval, and verification can reduce AI hallucinations.