A responsive website (RWD, from English responsive web design: design of reactive websites) is a website whose design aims, thanks to different principles and techniques, to offer a comfortable consultation on screens of very different sizes. The user can thus consult the same website through a wide range of devices (computer monitors, smartphone, tablets, television, etc.) with the same visual comfort and without resorting to horizontal scrolling or zooming in/out on touchscreen devices in particular, manipulations that can sometimes degrade the user experience, both in reading and browsing. 

A mobile application is a software equipped with a program. After downloading the latter, the file it contains is executed by an operating system. There are different types of mobile applications: native apps , web apps, and hybrid apps .