Responsive = Mobile Friendly
Modern HTML5 websites use responsiveness to automatically server content on different devices so that it renders as efficiently as possible.
This means that different devices, mobile phones, tablets, Laptops and PCs will see your website differently.
Typically, on smaller touch screen devices, content is simplified, data heavy slideshows are often removed or compressed & navigation is in a dropdown and scroll format so that it’s possible to easily select the content you are looking for.
Responsive mobile designs and layouts are in essence midway between your website and an App.
Because the majority of searches (in excess of 50%) are carried out on phones and tablets, failure to deliver mobile friendly content to your users will mean that you instantly lose over half of your potential traffic.
In addition, Google penalise sites that aren’t mobile friendly in (mobile) search results so you won’t appear as high as you do in PC / Laptop results.
As the world becomes more mobile and devices develop further, its expected that more and more searches will be on small screens, so your losses will be magnified.
Mobile compatibility isn’t difficult to deliver and its well worth checking that your site is suitable https://www.google.co.uk/webmasters/tools/mobile-friendly/
Making your site mobile friendly doesn’t need to be expensive or complicated. Ask Deehoseo.com for a full appraisal of your current site and their recommendations to make it compliant with best practice.