Magento 2.1.x Notice: Magento 2.1.18 is the final 2.1.x release. After June 2019, Magento 2.1.x will no longer receive security patches, quality fixes, or documentation updates. To maintain your site's performance, security, and PCIPayment Card Industry: Refers to debit and credit cards and their associated businesses. compliance, upgrade to the latest version of Magento. The Magento User Guide 2.1.x remains available in PDF for Open Source and Commerce.
Alternate Media Storage
Magento Open Source gives you the option to store media files in a database on a database server, or on a Content Delivery NetworkA large distributed network of servers that specializes in the high performance delivery of multi-media content. (CDN), as opposed to storing them on the file system of the web server. The advantage of using alternate storage is that it minimizes the effort required to synchronize media when multiple instances of the system that are deployed on different servers that need access to the same images, CSSCascading Style Sheets: A style sheet language that controls the appearance of HTML documents; a way to control the appearance of text, graphics, lists, links, and all other elements on a web page. files, and other media files.