It is important that your website can be viewed correctly on the device the viewer is using. These days there are so many different devices people use to look at websites that it has become much more complicated to design a website that can look good across allof these devices. When you think that the same website needs to look good on a mobile phone screen as well as reformat itself to look good on a 5K display (Like the new Mac Retina Display) you can understand why.

When you consider that a standard smart phone has a screen resolution across of about 320 pixels and a Mac 5K has has a screen resolution across of 5120 pixels the work of the adaptive display and the coding that goes into making it change the attributes of the website are clear.

There are some website designers that say they make responsive websites who aren't doing the complete process and discounting the new generation of UHD displays that are beginning to become the norm.

While their websites do act in a responsive way from the standard HD monitors and down to tablets and phones they don't make the websites also act in a responsive way to UHD displays. UHD displays include standard PC's which are now 4K, the entire Microsoft range of computers that are 4.5K as well as all new Mac computers that are 5K displays.