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Login to external application from salesforce with salesforce credentials

In our Salesforce org , in opportunity page we have a Custom link that directs to an internal application which is basically a login page.
Since that internal application uses the same salesforce login credentials we don't want the users to enter the username and password again and we want them to be able to use the same salesforce credentials and login to the applciation from salesforce directly without entering username ,password.

Can this be acheived through a Federated authentication in single sign on?