A responsive layout system is a combination of philosophies that solve the ever-changing landscape of digital devices. This is a design system that responds to a website’s layout for multiple screen resolutions using fluid grids. Images and media are flexible while content stays intact at any resolution. A breakpoint is a width at which the design “breaks” or starts to look bad. Using CSS, the layout is optimized to look good at each breakpoint.
Mobile-First Design Approach
Mobile-first is a philosophy that prioritizes the mobile platform when designing user experiences. Mobile is more restrictive due to reduced real estate. If you can support the worst-case scenario from a real estate perspective, you can support anything.