Device Pixel Ratio refers to the relationship between physical pixels and CSS pixels. For example: A DPR of 2 means: High DPR devices provide sharper visuals and smoother graphics. Modern smartphones often use high DPR displays. Responsive Web Design and Resolution Responsive design ensures websites adapt to all screen sizes. Developers use screen resolution checkers to test: Responsive design is essential for SEO and user experience. Importance of Viewport Size Viewport refers to the visible browser area. Different devices have different viewport sizes. Understanding viewport dimensions helps developers create responsive websites that work perfectly on all screens. Retina Displays Retina…