Responses are editable even after they’ve been submitted. The survey administrator has the ability to edit a response entry, or they can send a link through which the respondent can edit their entry.
When could this be useful?
At times, a respondent may need to update their responses. Perhaps a variable has changed, or they suddenly remembered something they’d like to add. This feature will allow you to send them at link through which they could update their answers, and they’ll be spared having to create a new response.
More explanation here in this video: