What is a dropdown UX?
A dropdown menu is a design pattern letting you display a list of contents, navigation points, and functions without flooding the user with many options simultaneously.
How many items should be in a dropdown menu?
In General, Avoid Drop-Downs When There Are More Than 10 or Fewer Than 5 Options.
What is a dropdown widget?
Dropdowns allow to toggle an element's visibility. They usually contain some sort of navigation, be it a bare list of links, or more complex elements. They can offer one to multiple nesting levels.