The Radio field allows you to set questions that require only one answer. This means that your respondents can only pick one answer from the question or select one information in a Radio field. A best use case is creating a form that has a section for your respondents to agree on terms and conditions.
This field is located under the Choice Option of the Drag & Drop section on your Builder page.
You can also allow your respondents to input their own choice answer by enabling the "other" option in the field options section of the edit modal of the Radio field.