You want to know what your visitors think about your website, product or brand? Ask them! User survey tools give you detailed reports and graphs about the answers your visitors and customers gave you. This gives you the opportunity to analyze what your visitors think about your website, product and brand. With the right skills you can translate this to valuable insights on how to improve your business.
User surveys differ from user feedback in that they take the form of questionaires and polls. They require greater effort by the respondent to perform, but can give more nuanced insights than the ad-hoc user feedback.