If your website is “responsive”, it will automatically adjust to suit the user’s screen size. Some features of normal websites can be difficult to use on a mobile device. Big fingers cannot press small buttons.
A responsive design alters the layout of the website to suit the screen size so that the visitor has a mobile-friendly experience and can see and navigate the site content. This is how our navigation bar looks on a mobile phone.
On a desktop computer our website has a horizontal navigation bar , this would be hard to view on small screens (like mobiles & tablets) so responsive designs convert the menu to a vertical style, making it easier to read and click each link.