They represent one or more actions that can be performed for the associated field or record. For example, you can use iconic buttons to display a validation form for the field, copy a record, and display a window for entering freeform text. A down arrow in the right side of the field indicates the field has a pull-down list.
Radio buttons are small circles used to select one of several options in a group.
Each radio button represents a choice for the group. You can pick only one radio button in a group. When you select a radio button, the previously selected button is cleared and a smaller, filled circle fills the newly selected button. Fields are areas on a form where you can enter, query, change, and display specific information. Checkboxes are small boxes used to enable or disable features or options.