What is a responsive design site?

Do you know any site that you access on the cell phone and use letters so small that you have to zoom to read? That site lacks responsive design.

Adaptive websites are intelligently designed to fit any kind of resolution, without distortion. An adaptable website identifies the width of each device and, in that way, manages to determine how much space is available and how the page will be displayed so that space is maximized. It also adjusts the dimensions of the images, fonts and other elements of the page so that they are not disproportionate.

In very practical terms, they are those sites that, with the same layout, perfectly match any resolution harmoniously, passing the same reading experience to the user, regardless of the device through which they are accessing.

A common confusion occurs between sites with responsive design and mobile versions of a site. There are some differences between those two characteristics also. 

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