An MCP server is a program that makes capabilities available to an AI client. It might expose files, database queries, issue trackers, documentation, browser actions, or business tools.
In practice
The AI app connects to the MCP server, discovers what it offers, and can request tool calls or resource reads when the user task needs them.
What to watch
An MCP server can expose powerful access. Configure credentials carefully and only enable servers you trust for the current task.