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srikanth mannesrikanth manne 

What is the use of ConnectApp in salesforce ? Why do we need Can anyone give an example

NagendraNagendra (Salesforce Developers) 
Hi Srikanth,

A "Connected App" is an application that can connect to over Identity and Data APIs. Connected Apps use the standard OAuth 2.0 protocol to authenticate, provide Single Sign-On, and acquire access tokens for use with Salesforce APIs.

In addition to the standard OAuth capabilities supported by the existing Remote Apps feature (which Connected Apps is designed to replace), Connected Apps add additional levels of control, allowing administrators explicit control over who can use the application, and various security policies to be enforced by the application.

May I suggest you please follow the below trailhead module which has step by step explanation. Hope this helps.

Kindly mark this as solved if the reply was helpful.