Cross-platform design is an essential part of modern interface design. It involves creating interfaces that work seamlessly across a wide range of devices and platforms. This means that regardless of whether your users are on desktops, tablets, or mobile devices, they will be able to use your app or website without any issues. To achieve this, designers use responsive design principles, which ensure that the interface adapts to the screen size and resolution of the device it's being viewed on. Beyond this, the design must also take into account user needs and behaviors. This means understanding how users interact with different devices and platforms, as well as what they expect from the interface. By doing so, designers can create cohesive and user-friendly interfaces that provide a seamless experience across all devices and platforms.