Jquery Mobile was developed to make the development of web applications targeting mobiles very easy. It was introduced after the success of Jquery. There are ever increasing mobile devices in the market and each new device is different from the other. Then there are tablets and they too are of different sizes and are also based on different platforms like the apple iPad or the Samsung Tab. So there is a very high demand for websites that function according to the size and orientation of the device. This is where Jquery Mobile comes into picture. Jquery Mobile is also compatible with Phonegap.