What does headless login for Salesforce using SSO mean?

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Headless login for Salesforce using SSO refers to the process of authenticating a user into Salesforce without a graphical user interface (headless) and using single sign-on (SSO) credentials. This is achieved through API calls that log the user in and provide access to Salesforce resources without requiring the user to manually enter login credentials. Headless login can be useful for automating processes or integrating Salesforce with other systems, as it allows for seamless authentication without user intervention.