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The “free text” field - it provides the respondent with a text field into which he/she can type their answer. This type of question would be used when asking the respondent for their name, for comments or explanations etc.
The question details page includes a number of fields and options. All the properties available for this question type are described in the Question Properties documentation (go to Accessing Question Properties for more information).
Note that in the question properties for this question you can specify that the response must be an email address. The response will then be validated to ensure it has the correct format. Be aware that the system cannot check whether the address actually exists.
Figure 1 - The Text item’s question details page
A variation on this question type is the Text List item. This item provides the respondent with a list of answer options, and allows him/her to type 'free text' into a text field beside each option (go to Text List for more information).
Don't Know and Prefer Not to Answer Choices
When designing this question, you can choose to add "Don't know" and "Prefer not to answer" options.
These options will appear beneath the question when users take the survey; selecting either option allows the user to continue without entering an answer in the field.
Learn more here: Don't Know and Prefer Not to Answer Choices.