This document discusses 5 reasons for marketers to employ responsive design in their campaigns. It notes that responsive design creates a seamless experience across devices and enhances user interaction. It then provides the 5 key reasons: 1) Better user experience as most users access information on mobile. 2) Better campaign results as conversion rates increased 140% for one company using responsive design. 3) Efficiency and consistency as a single responsive design is easier to maintain than separate designs. 4) Google recommends it as responsive pages load faster and help search engine optimization. 5) Improved social engagement as 60% of social media time is on mobile.