An input that allows users to make a single selection from a pre-defined list of familar and/or quantitative options. Use radio buttons instead when the user needs to scan, compare, and evaluate multiple similar and/or qualitative options.
Examples & Guidelines
Sort the list in a logical order. Put the most popular choice at the top.
A dropdown should have no fewer than 2 options.
Lists that are longer than 12 options should allow autofill.