Responsive design is an approach to building websites and interfaces so they automatically adapt their layout, images, and content to fit any screen size, from a small phone to a large desktop monitor. It relies on flexible grids, fluid images, and CSS media queries instead of separate fixed layouts for each device.
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The goal is a single site that stays usable and readable no matter what device it's viewed on, without you having to build and maintain multiple versions.

Why does Responsive design matter?

With people browsing on everything from tiny phones to ultrawide monitors, responsive design ensures your product stays usable and looks polished on every one of them. It also saves you time and money since you maintain one codebase instead of separate mobile and desktop sites.

For example, a navigation menu might show as a full horizontal bar on desktop but collapse into a hamburger icon on mobile. Search engines like Google also favor responsive, mobile-friendly sites in their rankings.

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