By iOPW
A responsive website is such that is able to display properly not only in a browser of a desktop computer but also in a range of web friendly peripherals like tablets, smart phones as well as laptop computers.
As the screen sizes and resolution of each of these devices is different, your website design must be able to shrink and shift its elements to adapt to each display.
This functionality is also referred to as mobile friendly. If you're not certain if your website is responsive/mobile friendly you can do so by plugging it into the following google link: