Responsive images adapt to different screen sizes using the srcset and sizes attributes. This approach allows you to serve different versions of an image depending on the user's device, ensuring that images look good and load efficiently on all screens. Instead of always sending the largest image, you can provide a set of images at various resolutions and let the browser choose the best one based on the device's display and viewport size.

Use descriptive alt text for each version of your images to improve accessibility. Avoid using large images where smaller ones suffice, as this helps your pages load faster and reduces data usage for users on mobile devices.