When we say in a two tier application like the client server model , the user requests information from an User Interface application which then gets the information from the server and returns the response to the browser . In this example is the user who is requesting application from its local machine the client or is it the user interface application hosted in some machine the client?
In 2-tier applications, it is the application(presentation layer) that serves as a client whereas the database serves as a server.
I hope this will clear your point. If you still have any confusion then please let us know.