How a drop-down menu can be created (usually in a form)?

By using the select (menu control), option (an option within a menu) elements.

• Drop-down menus (only one item can be selected):
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<select name="varName" >
    <option value="EBTG">Everything but the girl</option>
    <option>Aerosmith</option>
    <option>The Cure</option>
</select>