Dropdown select or Dropdown select + button?

1. Which is correct dropdown or drop-down?
2. What is the correct way to define dropdown?
3. What is the difference between select and dropdown?
4. How do I add a button to a dropdown list?

Which is correct dropdown or drop-down?

On the other hand, Merriam-Webster lists “drop-down” and “dropdown” as equal variants for the noun form (the adjective form is always hyphenated), so maybe there's hope for you.

What is the correct way to define dropdown?

A drop-down list (abbreviated drop-down, or DDL; also known as a drop-down menu, drop menu, pull-down list, picklist) is a graphical control element, similar to a list box, that allows the user to choose one value from a list. When a drop-down list is inactive, it displays a single value.

What is the difference between select and dropdown?

Select versus Dropdown

It works best in forms when users choose an option from the select list and submit data. A dropdown presents a list of options that users can select one or several options from that list. Dropdown options are used for taking an action, filtering, or sorting existing content.

How do I add a button to a dropdown list?

Example Explained. Use any element to open the dropdown menu, e.g. a <button>, <a> or <p> element. Use a container element (like <div>) to create the dropdown menu and add the dropdown links inside it. Wrap a <div> element around the button and the <div> to position the dropdown menu correctly with CSS.