Usability Testing generally includes testing user interface (UI) and user experience (UX). One is about testing your Graphical User Interface and how it looks & behaves, while the other focuses on user experience and user behavior.
Every app developer should consider usability testing in order to see user reactions and possible areas of improvement before the application is rolled out to users.
Usability testing help design & development teams to detect bugs at the earlier stage of development.
Usability testing ensure the accuracy in product results at the time of its release in market.
Usability testing evaluate how much time participants takes to complete a successful task.
Usability testing make it sure that users are fully satisfied with your designed Web site or App.
Usability testing measures identify the changes required to improve overall performance.
Usability test analysis measures will make an IT product more efficient by meeting required development criteria.