Final answer:
A closed shell system in informatics is a computer system that is isolated and protected from direct user access. It limits user access to specific resources and functions, maintaining system integrity. An example is a school computer lab with restricted permissions.
Step-by-step explanation:
Closed Shell System is a term used in Informatics to describe a computer system that is isolated and protected from direct access by users. It is designed to prevent unauthorized access and maintain the integrity of the system. In a closed shell system, users interact with the computer through a restricted environment, such as a command line interface or a specific application, which limits their access to certain resources and functions.
For example, consider a school computer lab where each student has an individual account with limited permissions. The computers in the lab are configured as closed shell systems, allowing students to perform specified tasks, such as accessing educational software or browsing the internet, while preventing them from altering system settings or accessing sensitive files.