Responsive Web Design
Responsive Web Design makes your web pages look good on all devices (Desktops, Laptop, Tablets and Smart phones).
The use of mobile devices to surf the web is growing at an astronomical pace, but unfortunately much of the website is not mobile devices supported. There is a multiple different screen sizes across Smart phones, phablets, tablets, Laptop, desktops. Screen sizes will always be changing, so it's important that your site can adapt to any screen size, today or in the future.
If your web site is not Responsive you lose your mobile devices user customer.
Responsive web design is becoming more important as the amount of mobile traffic now accounts for more than half of total internet traffic. This trend is so prevalent that Google has begun to boost the ratings of sites that are mobile friendly if the search was made from a mobile device. This has the net effect of penalizing sites that are not mobile friendly.