From the moment a user lands on your product to the last step where they subscribe, enroll, or check out, there are a whole lot of things that can go unexpectedly. For instance, links might be broken, users may fill in the wrong details or upload the wrong formats, or pages might be unresponsive. In any such scenario where things do not go as planned, it is vital to keep users informed of what is going on. Error messages perform the role of keeping your users in the loop on what went wrong in a polite, helpful, and solution-oriented way.