Microsoft is on a mission. A mission to get custom code out of the SharePoint server. But how are we to deploy new functionality then? The answer is, using REST and CSOM. Introduced in SharePoint 2010, and greatly improved and expanded in SharePoint 2013, REST and CSOM is one of the fundamental pillars in SharePoint knowledge that you must master.
Sahil Malik has been a Microsoft MVP for the past 8 years, author of several books and numerous articles in both the .NET and SharePoint space, consultant and trainer who delivers talks at conferences internationally.