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In this tutorial, the presenter demonstrates how to remove a selected value from one dropdown based on the choice made in another dropdown using jQuery. The video showcases a simple view with two subject dropdowns. When a subject like "Chemistry" is selected in the first dropdown, it is automatically removed from the second dropdown. The tutorial details the code structure, starting with the head section that includes the title and Bootstrap. The presenter explains the setup of both dropdowns, their IDs, and how to utilize the "on change" event to track selections and manipulate options accordingly. The goal is to ensure that each dropdown contains unique subject options.