What is the difference between checkbox and dropdown?
Use a checkbox list if you have a small to medium number of options, and want the user to select one or more of the options. If you have a checkbox list that has many options, it's often better to go with the Dropdown List with Multi-selection (see below).
What are Dropdowns used for?
Offering drop-down menus can help users avoid scrolling and can quickly get them access to your site's content. For large websites, drop-down menus can save users time by allowing them to jump down a level or two to get to the content they seek.