What is the difference between responsive web design and mobile-first design?

Question

The **Responsive Web Design** (RWD) is a massively used term, and sometimes a bit to the right and to the left throughout the web production chain. Among the following proposals, choose those that actually apply to RWD:

Accepted Answer

The main objective of RWD is to adapt to any type of device in a transparent way for the user, and to provide the best possible browsing experience.

Accepted Answer

It is strongly advised to consider Responsive at the time of designing the web project.

Answer

RWD refers to the CSS3 @media rules, called the “Medias-Queries”, which allow the application of style sheets depending on the devices used.

Answer

Doing RWD saves time in the development of the project.

Question from the HTML5/CSS3 test

What is the difference between responsive web design and mobile-first design?