Doc: Clarify MCP client-server model in What is MCP? section

Author: yuka-with-data

README.md

@@ -207,7 +207,11 @@ In the inspector UI, connect to `http://localhost:8000/mcp`.
 
 ## What is MCP?
 
-The [Model Context Protocol (MCP)](https://modelcontextprotocol.io) lets you build servers that expose data and functionality to LLM applications in a secure, standardized way. Think of it like a web API, but specifically designed for LLM interactions. MCP servers can:
+The [Model Context Protocol (MCP)](https://modelcontextprotocol.io) lets you build servers that expose data and functionality to LLM applications in a secure, standardized way. Think of it like a web API, but specifically designed for LLM interactions. 
+
+MCP follows a **client-server model**, where LLM applications act as clients and connect to MCP servers to access capabilities such as data retrieval and tool execution in a consistent format.
+
+MCP servers can:
 
 - Expose data through **Resources** (think of these sort of like GET endpoints; they are used to load information into the LLM's context)
 - Provide functionality through **Tools** (sort of like POST endpoints; they are used to execute code or otherwise produce a side effect)