What Is an MCP Server?

An MCP (Model Context Protocol) server is a small program that gives an AI app a new ability — like generating UI, querying a database, or reading files — through one open standard created by Anthropic. AI clients such as Cursor, Claude Code, and Claude Desktop connect to these servers and use their tools automatically.

Model Context Protocol (MCP) is the USB-C of AI tools — one open standard that lets any AI editor plug into any tool. Here is what a server actually is and why it matters.