Update README.md

README.md

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-# Advanced-RAG
+# Advanced RAG
+
+**What is RAG?**
+
+Retrieval augmented generation (RAG) is a natural language processing (NLP) technique that employes the capabilities of retrieval and generative based AI models.
+
+**What is Naive RAG?**
+
+Naive RAG often refers to splitting documents into chunks, embedding them, and retrieving chunks based on semantic similarity search to a user question.
+
+It's simple, but of poor overall performance.
+
+**That's why we need Advanced RAG.**
+
+In this tutorials (Advanced RAG), we will learn the techniques and best practices in RAG application development, that can improve the quality of the RAG.
+
+It's crucial to the success of a RAG application.