Now a requirement not an option!
Web design has always been a fast paced medium constantly changing as technology evolves. In the last couple of years we have seen this process quicken as tablets and smart phone flood onto the market. Initially designers focused on building separate mobile sites but as screen sizes expanded this quickly became impractical.
In response developers switched to a responsive approach where websites became flexible, adjusting to fit the screen they were being viewed on. Instead of having to pinch and zoom images and content blocks stacked neatly allowing users to easily scroll through the content.