In the mobile age responsive design is crucial. This means the website will adapt for the device being used. Your website should be designed to be viewed on Computers, Smart phones and Tablets providing easy reading and navigation without the need for resizing or panning.
Here is an example:
A non responsive website that has been designed to fit a computer screen shrinks the web page onto the smaller screen of a mobile device.
The images become too small to view, the text too small to read and the navigation menu too small to find and use accurately.
A responsive website automatically detects the device being used and adapts the content to provide easy reading and user friendly navigation.