Responsive Design
A responsive website is one that responds (or changes) based on the needs of the users and the device (mobile device in this example) that they’re viewing it on. Here, text and images change from a three-column layout, to a single column display. Unnecessary images are hidden so they don’t interfere or compete with the more important information on the site’s smaller display.
If you are on a computer, you can tell if a site is responsive by reducing your browser’s window size from full screen down to very small. If the appearance of the text, images and menu change as you get smaller, the site is responsive.
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