Importance of Responsive Design

what is responsive design and why is it so important in web designing today? This term came into existence in 2010 when Ethan Marcotte coined this term “Responsive Web Design”. As the need for Responsive web design grew since 2010 it became more and more popular and widely used by the web designers. A very popular tech website “Mashable” has called 2013 the “Year of Responsive Web Design”, and know it’s going in 2014.