What does it mean by"responsive webpage"? Give an example?

Answer 1

Lets say you want to make a quiz. You will have to use JavaScript to evaluate your answers. Then the JS will *add* HTML code to display your result. This is an example of a responsive webpage

Another example is a calculator

Answer 2

Responsive Web Design (webpage) is about using HTML and CSS to automatically resize, hide, shrink, or enlarge, a website, to make it look good on all devices.

Example: Having a webpage designed for a large screen, to be functional and fit into a smaller screen such as a smartphone.

More info
https://developers.google.com/web/fundamentals/design-and-ux/responsive/