I have been getting questions and seeing genuine confusion around the terms MCP and MCP Server.
The two terms sound similar, are used interchangeably in many conversations, and one assumption keeps surfacing:
“MCP Server is where I host my MCP.”
That confusion is understandable. After publishing the earlier walkthrough, Step by Step: Host and Integrate C# MCP Server with Copilot Studio, the most common follow-up question has been:
“If I build an MCP server in C# and host it in Azure, is Azure the MCP Server?”
The short answer is:
No. MCP is the protocol. The C# application is the MCP Server. Azure is only the hosting platform.
Let’s understand this with a simple explanation.
What is MCP?
MCP (Model Context Protocol) is an open standard for connecting AI applications to external systems and tools. It uses a client-server architecture and JSON-RPC 2.0 messages.
A useful mental model for .NET developers:
- REST defines how web clients and servers communicate over HTTP.
- MCP defines how AI applications and external capabilities communicate.
So when someone says “I built an MCP,” what they usually mean is “I built an MCP Server” or “I built a solution that uses MCP”.
What is an MCP Server?
An MCP Server is the program that implements the MCP protocol and exposes capabilities (tools, data, prompts) to AI applications.
The official MCP architecture documentation is explicit on one important point: an MCP Server is the program that serves context data, regardless of where it runs. It can run locally (typically over STDIO) or remotely (typically over Streamable HTTP).
The word server describes the role in the protocol, not a physical machine or cloud resource. Exactly like:
- Web server
- SQL Server
- Mail server
In all of these, “server” describes what the software does, not where it is hosted.
🙂
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