When building modern interfaces, you often need to adjust your layout or content depending on the screen size. The useMediaQuery hook in MUI makes this process straightforward by letting you detect the current viewport size and apply responsive logic directly in your React components. For instance, you might want to show a different navigation bar on mobile devices compared to larger screens. Here is how you can use useMediaQuery to check if the viewport is mobile-sized and render different content accordingly:

In this example, the isMobile variable becomes true when the viewport is 600px wide or less. You can then use this value to conditionally render different elements, such as a compact menu for mobile or a full dashboard button for desktop users.

The useMediaQuery hook works seamlessly with MUI's breakpoint system, making it easy to align your responsive logic with the design standards provided by MUI. Breakpoints in MUI are predefined screen widths such as xs, sm, md, lg, and xl, which correspond to common device sizes. By using queries like theme.breakpoints.down("sm") or theme.breakpoints.up("md"), you can ensure your components respond predictably to different screen sizes. This integration allows you to write logic that matches the same breakpoints used in your styles, keeping your layout and conditional rendering consistent across your application.