You can select 4 different variation selectors:
- Drop-down – the user will be able to select one of the values from a dropdown
- Radio – the user will be able to select one of the radio buttons
- Checkbox – the user will be able many values with checkbox
- Custom – the user will be able to add a custom text
Default Variation Selector
In Catalog Settings > Attributes > Variations you can also set the default selector for each variation: