Mobile web sites improve web usability for people using smartphones or tablets.
A mobile web site is a site - or a version of a site - designed specifically to display well and be usable on mobile devices such as smartphones or tablets. Mobile site design usually includes larger buttons or links with more space between them to make them easier to use as well as larger text to make it more readable on smaller screens.
As mobile devices become more popular and gain wider usage, it is important that your site work on mobile devices. Some internet users will have a smartphone or a tablet, but will not have a desktop or laptop computer. This makes it even more important that your site works well on mobile devices. While making sure you get a compatible web site will insure that users on mobile devices can use and access your web site, having a mobile specific design available will improve their experience on your web site. In addition, search engines, most notably Google, have started ranking sites with an available mobile version differently (especially for people searching from a smart phone) in their search results. A mobile site varies from a responsive web site in the ability for the site visitor to choose to switch to a desktop version of the site.