In Server Object Model, the SPWebApplication objects represents a SharePoint Web Application, which is located and hosted is an IIS virtual server.
Using this class you can access the object of web application you want to and do high level operations, such as getting all the features of an entire Web Application instance, or doing high level creation operations like creating new Web Applications through code.
Using this class you can access the object of web application you want to and do high level operations, such as getting all the features of an entire Web Application instance, or doing high level creation operations like creating new Web Applications through code.