Responsive web design (RWD), is a web design approach aimed at crafting sites to provide an optimal viewing experience — easy reading and navigation with a minimum of re-sizing, panning, and scrolling — across a wide range of devices these include:

• Desktop computer monitors, 
• Mobile phones 
• Tablets

Responsive web design is all about automatically delivering your audience the content they want, within the context that they’re viewing it.

There is a large amount of data suggesting that the mobile web is key. According to the Pew Research Center, 60% of tablet users prefer reading news on the mobile web than via an app. While I think media companies should certainly offer apps, it's clear that having a great mobile website should be the priority.

The benefits are obvious: You build a website once (with one lot of hosting), and it works seamlessly across thousands of different screens.

Given the rapid adoption of tablets and smartphones — and the fact that users currently seem to prefer reading their news on the mobile web rather than in apps.

For publishers, it offers the simplest way to reach readers across multiple devices. For users, it ensures a great experience on every screen.