SharePoint 2013 Developer Features
SharePoint 2013 Developer Features Overview
Client Side Object Model
If you're building applications that run outside of the SharePoint Server, take advantage of the CSOM. This helpful tool is able to find, update and manage your data in SharePoint 2013. Developers can rejoice that CSOM is offered in different formats to accommodate your developing needs, whether you use JavaScript, .Net or Silverlight applications.
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SharePoint 2013 CSOM
Apps for SharePoint
Sandboxed Solutions have been replaced in SharePoint 2013 with "SharePoint Apps". SharePoint apps have more powerful capabilities than Sandboxed Solutions such as the ability to utilize cross site collection data, have unique locked down permissions, and are built with familiar languages and IDE's. Each app works in a unique way to add value to the functionality and capabilities of your SharePoint site.
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SharePoint 2013 Apps
Business Connectivity Services
Business Connectivity Services for SharePoint 2013 supports integrated data solutions by allowing SharePoint developers to hook into external line-of-business (LOB) data for enterprise-scale SharePoint integration. This is done by introducing external data to SharePoint through a cloud or on-premises configuration and letting users work with that data in the familiar SharePoint 2013 setting.
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SharePoint 2013 BCS
