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ravi teja 81ravi teja 81 

what is the exact use of custom settings and externaldata sources

hi in one of my application they created custom settings with field of datatype URL. it was invoked in classes to get data . can any one tell what is the use of cutom settings. and i want to know about exernal data sources. cn i directly use SAP service URL in the URL mentioned in external data sources please tell me
PratikPratik (Salesforce Developers) 
Hi Ravi,

External data source: You can connect any data source to Salesforce , if you can expose/publish it to ODATA 2.0 protocol.
It's basicall Lightning Connnect feature.

You can refer to:
http://blogs.salesforce.com/company/2014/11/use-salesforce1-lightning-connect-to-solve-integration-nightmares.html

Thanks,
Pratik