Responsive Web design is an approach to Web design that aims to develop sites that provide an optimal reading and browsing experience for the user regardless of the range of devices (mobile phones, tablets, reading lights, desktop monitors).

A successful “Responsive” user experience involves minimal resizing (zooming), cropping, and multi-directional scrolling of pages.

The term “Responsive Web design” was introduced by Ethan Marcotte in an article in A List Apart published in May 2010.
He will then describe his theory and practice of responsive in his book “Responsive Web Design” published in 2011. This is limited to client-side adaptations (flexible grids in percentages, fluid images and CSS3 Media Queries).
Dedicated site, application or responsive?

We currently have three ways to convey web content on connected devices: a dedicated site, a native application and a responsive version of a website.

Each solution has advantages and disadvantages: depending on your needs and constraints (especially budget and deadlines), it may be perfectly relevant to opt for one or the other.

Translated with www.DeepL.com/Translator (free version)