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Which all authentication can be maintain when a third party application make a SOAP callout in salesforce?

Hi All,

I wanted to know how authentication can be maintained when a third party application make soap callout to salesforce to fetch data from salesforce.A WSDL file has been shared to the thrid party application in order to make a callout but how salesforce will understand that the callout is coming from the third party application only and not from other sources.Which all good practices we should follow?