The Webflow CMS is the"dynamic" part of the no-code Webflow tool. The CMS is organised in collectionswhich contain different items.
The CMS (content management system) is a database that automatically populates specific fields connected to your collections or dynamic pages (such as blog pages) on your site.
Example: one of your collections is called "blog post". Each article created will be an item that will automatically create a new dynamic page, whose fields are connected to your "Blog article" database (collection).