Responsive Web Design (RWD) is a label given to the tool which includes the technologies like HTML and CSS3 media queries, which is applied to the dimension. It enables the website to alter itself to any platform with dissimilar screen size, hence named as "Responsive Web Design". In Simple words, Responsive Web Design implies it makes the website to become more responsive and to alter themselves according to the habitat like screen size, screen alignment, and operating system.
The significance of RWD: In today's fast moving competitive world, everyone is coming up with different ideas and style (unfamiliar display sizes and operating system, e.g.: Google Glass). In order to be in competition and utterly prepared to acculturate the change, your website should adopt Responsive Web Designing tool. Not only it aids in making the website better matched with dissimilar platform and size but also helps in Search Engine Optimization (SEO) as Google gives superior ranking compared to the website who have not adopted this tool.
RWD: An option or mandatory aspect while designing: It may rely on several aspects like if someone is initiating/designing the website from groove then RWD is mandatory. If someone wants its web development more economical then also RWD comes handy as it provides the option to sustain a solo site for the collective platform. Ultimately as it is scalable, it will reconcilable with all latest devices with minor refinement.