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Shivam Tripathi 38Shivam Tripathi 38 

I want to login my community users from different app and want to access the data from my community in respect of login user.

SwethaSwetha (Salesforce Developers) 
HI Shivam,
What is the app you are referring to here?

On a general note, SSO enables users to authenticate once and gain access to multiple applications without the need to login again.

See related: https://salesforce.stackexchange.com/questions/296247/access-by-same-community-user-to-two-communities

https://developer.salesforce.com/forums/?id=9062I000000IW6oQAG

If this information helps, please mark the answer as best. Thank you