Explanation/Reference:
Note:
*introducing Central Administration
At the heart of every server farm is the configuration database. This database stores the majority of your core server farm configuration. The association of Service Applications, configuration of Web Applications and content databases, email settings, server services architecture, farm solutions, and farm features are stored in this database. To manage all this configuration data, you need a tool. Central Administration is the primary administrative tool available to you
* Site collection administrators now have the authority to upload, activate, delete, and manage sandboxed solutions using the new Solution Gallery, which is a repository of sandboxed solutions.
* You can store apps for SharePoint and Office apps for your organization's internal use in an App Catalog site.