Adaptive design is the counterpart of responsive web design. In contrast to responsive design, adaptive design also allows the functionalities of the website itself to be adjusted instead of just the layout.
As a result, the maintenance and start-up costs for an adaptive website are often higher. You need at least three designs for one website.
An adaptive design is characterized by the fact that it cannot be scaled by pulling on a corner of a browser screen. The mobile layout is there “suddenly”.