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What is WSDL2APEX and Use of WSDL2APEX in Salesforce

WSDL2APEX:
Apex Classes can be automatically generated from a WSDL document.

Use of WSDL2APEX:
Developers can be used to invoke the external Web service Using generated Apex Class.

Generate from WSDL2APEX is available in Sandbox or a Developer Edition.

Setup -> Develop -> Apex Classes ->
And hit the button called ‘Generate from WSDL’

To Know more about WDSL2APEX, Salesforce Developer