Responsive Design is designed logic wherein the design of the representation of the web and the layout of the web changes or adapts as per the layout of the device. The main reason to have a responsive design is to increase the traffic of your application to a bigger client base using a set of devices.
Usage of mobile has increased in recent years. people use internet mobile rather using it on desktop or Laptop. To show the importance of this fact below are some statistics given
Factors to be optimized
To have a Mobile optimized website is must otherwise users can't easily browse to access content on your site. Marketers with the Mobile optimized site have more traffic on their site then their competitors.
The users nowadays are on go and access the internet through their mobile phones. so, it's important that a visitor can navigate the website pages and content easily in mobile which increase the possibility of converting users into clients.
Web page loading speed is important as time is limited. A user will abandon a webpage if it takes more than 6-10 seconds. A mobile optimized webpage will load much faster which helps in increasing the website traffic.