What are responsive images designed to do?

Responsive images are designed to automatically adjust to fit the size of their container. This functionality is crucial in web development as it allows images to scale appropriately on different devices, including smartphones, tablets, and desktops. By using responsive image techniques, such as the srcset attribute in HTML or CSS media queries, developers ensure that images maintain their quality and aspect ratio while also being visually appealing and efficient for users across various screen sizes. This approach enhances user experience by providing images that are not only suitable for the device being used but also load efficiently without compromising the layout of the webpage.

While other options touch on important aspects of image handling, they do not fully encompass the primary purpose of responsive images. For example, ensuring the same image displays on all devices contradicts the concept of responsiveness, where images should vary based on the user's screen size. Similarly, optimizing images for faster loading times and reducing file size are important for performance, but they do not directly pertain to the adaptability of images within different container sizes.