SharePoint 2013 Sites and Content server class library
Find a list of the major public namespaces in SharePoint 2013 that run on servers and that contain functionality for managing content and sites.
Applies to: SharePoint Foundation 2013 | SharePoint Server 2013
The Sites and Content class library reference for SharePoint 2013 lists .NET server namespaces. These namespaces contain classes and other members that are designed mainly to help you write code for SharePoint end users and low-level administrators, such as site owners.
For information about classes that run on a client, see .NET client API reference for SharePoint 2013.