What is responsive design and why is it important?

Responsive design creates websites that adapt to different screen sizes and devices, providing optimal viewing experiences on desktop, tablet, and mobile. It's important because most web traffic now comes from mobile devices, and users expect sites to work well on their device. Responsive design improves user experience, reduces bounce rates, and can improve search rankings since Google prioritizes mobile-friendly sites. It's also more efficient than maintaining separate mobile and desktop sites. Responsive design uses flexible layouts, images, and CSS media queries to adapt content. Example: A responsive site might show a horizontal navigation on desktop but switch to a hamburger menu on mobile, with content reflowing to fit the narrower screen.