What does the helper class ".hidden-xs" do?

The helper class ".hidden-xs" is used to hide content specifically on mobile devices, allowing for a responsive design that caters to different screen sizes. When this class is applied to an element, it ensures that the content is not displayed on devices that have extra small screens, such as smartphones. By using this class, developers can optimize the user interface for different device types, providing a better user experience on larger screens while preventing unnecessary elements from taking up space on smaller devices. This approach is part of a broader responsive design strategy that aims to enhance usability across various platforms and screen sizes.