A web user can see the website on any device. Most Commonly used devices are Mobile, Smart Phone, Tablet, Desktop Computer,
and Laptop. Mobile phone don't have operating system. Smartphone having mobile operating system. Computer
and desktop having operating systems. Device features are varied Depend on the device brand, and model.
Responsive web design make the website contents can be viewed on any device. Responsive web design is based on the device
screen size. Responsive Web design basic tasks are modifying the layout changes, rearrangement of content,
display or hiding of content elements for the device screen size.