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Explain how vector databases help RAG applications.

Write a beginner-friendly explanation about: Explain how vector databases help RAG applications.. Include one real-world use case and one common mistake to avoid.

You are a senior AI educator. Explain: Explain how vector databases help RAG applications.. Audience: junior developers. Constraints: 300-400 words, practical examples, one architecture diagram description, and a final checklist. Output format: headings + bullet points.