What is responsive web design?
 

I think a design which is suitable to smartphone, tablet, desktop and tablet screen? I said right or wrong?

It will support both mobile,tablet.....

Responsive web design is the most used design for the websites in today's time, because responsive design is responsible for optimizing the design of website as per the device we are using, i,e mobile, laptop, ipad etc..

Hello,

Responsive Web design is the approach that suggests that design and development should respond to the user’s behavior and environment based on screen size, platform, and orientation.