Final answer:
The statement that an application can still run without an open window on an iMac is true. Applications like email clients or file-sharing apps can work in the background and can be monitored via Activity Monitor or indicated by the Dock.
Step-by-step explanation:
The statement is true. Applications on an iMac, or any computer running macOS, can continue to run even when no window is visible on the desktop. This is a common feature for various types of software, especially those that perform background tasks, like email clients checking for new messages, music players playing tunes, or utilities that sync files or data across the internet.
For instance, you may close the main window of your email application, but the application could still remain active in the Dock, indicated by a small dot beneath its icon. This allows the application to keep receiving emails and notify you of new messages without having a window open. Another example is a file-sharing app that continues to upload or download files in the background.
In macOS, you can use tools like the Activity Monitor to view all running applications and processes, regardless of whether they have visible windows. The app's menu bar or the Dock can also indicate if an application is running.