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SATYA ADMINSATYA ADMIN 

what is oauth and how salesforce maintain oauth architecture and is it possible to customize our application.

Vasani ParthVasani Parth
Satya :

OAuth is all about sharing. The OAuth is a protocol that enables a website (the consumer) to access protected resources from another web service (the service provider) through an API. The benefit of OAuth is that the API does not require users to disclose their provider credentials to consumers, and they can revoke the consumer's access to the service provider at any time.

This link (https://developer.salesforce.com/page/Using_OAuth_to_Authorize_External_Applications) will give you complete understanding of OAuth and how Salesforce maintains its OAuth architechture.

Please mark this as the best answer if this helps