The System Menu includes tools to import and export data, install extensions, manage system caches and indexes, manage permissions, backups, system notifications, and custom variables.
The System menu is on the Admin sidebar, click System.
The Import and Export tools give you the ability to manage multiple records in a single operation. You can import new items, and also update, replace, and delete existing products and tax rates.
Manage integrations and extensions for your store.
Manage your system resources, including cache and index management, backups, and installation settings.
Magento uses roles and permissions to create different levels of access for Admin users, which gives you the ability to grant permission on a “need to know” basis to people who work on your site.