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The command used to display the current database in MySQL is `SELECT database()`. This function returns the name of the currently selected database for the current session. It is especially useful in environments where multiple databases might be present and users need to confirm the context in which they're operating.

The function works simply by calling it with no arguments, and it will produce the name of the database you are currently interacting with, making it a straightforward and efficient way to keep track of what database you are querying at any given moment.

The other options listed do not serve this purpose. The `SELECT current_database()` command, for instance, is similar and might be expected to work, but it is not the most commonly used way to retrieve the current database name, as `SELECT database()` is more frequently referenced in documentation and tutorials. The commands related to `@@hostname` and `@@version` provide specific information regarding the server's hostname and version, respectively, and are not related to the current database context.