Hi All,
I got very good articles regarding the Data, jQuery, OData, RESTFul, _api in SharePoint 2013. Hope these links may help other too so i am sharing the same here.
http://blog.concentra.co.uk/2013/02/04/understanding-odata/
http://blog.concentra.co.uk/2013/01/31/restful-services/
http://blog.concentra.co.uk/2013/02/06/odata/
Regards Amit