As large language models continue to transform how we build intelligent systems, the ability to integrate proprietary data through vector search and RAG has become essential for creating accurate, contextually-aware applications that go beyond the limitations of pre-trained models. This comprehensive guide takes you from foundational concepts to production-ready implementations of vector databases and RAG systems. Starting with vector semantics and embeddings, you will learn to generate vector representations using neural networks, BERT, and OpenAI models. The book covers popular vector databases including Weaviate and Milvus, teaching you how to implement efficient search algorithms like k-nearest neighbors and hierarchical navigable small worlds. You will build complete RAG pipelines, explore advanced techniques like GraphRAG, and master evaluation frameworks using LlamaIndex. Each chapter includes hands-on Python examples with practical code implementations that demonstrate real-world applications. By the end of this book, you will have mastered the skills needed to design, build, and evaluate production-grade vector search systems and RAG applications. You will be equipped to enhance LLM applications with private data, implement semantic search at scale, troubleshoot retrieval issues, and solve real-world information retrieval challenges using cutting-edge AI techniques with confidence. WHAT YOU WILL LEARN ● Generate embeddings using neural networks, BERT, and OpenAI models. ● Implement vector search algorithms including KNN and HNSW. ● Develop GraphRAG systems for structured knowledge representation. ● Evaluate and optimize RAG applications using LlamaIndex frameworks. ● Design scalable vector database architectures for production environments. ● Integrate vector search with LLMs for intelligent retrieval. WHO THIS BOOK IS FOR This book is designed for data scientists, machine learning engineers, and software developers who want to build intelligent search and retrieval systems using modern AI techniques. It is ideal for professionals working with large language models who need to integrate private data, implement semantic search capabilities, or build production-ready RAG applications.