A regular website is usually designed for viewing on a desktop computer. When viewed on a smaller mobile device, the user experience isn’t that great for a non-mobile website as certain elements from the site might not appear or may not function optimally.
Mobile-optimized sites solve this problem by creating a version of the website that specifically designed to look great on all mobile phones. In addition, mobile websites may also include features that take advantage of the advanced capabilities of a mobile phone such as a click-to-call button that, when clicked, places a call. A mobile website is typically designed for use with mobile phones including large buttons known as “thumb-friendly” due to the practice of users to use thumbs as the source of action on a mobile phone.