Touch is a physical feeling which can be felt by living beings and it is especially applicable to human. We did not expect a touch can make a non living thing to do work before hundred years. But nowadays the touch makes many things simple in our life. The touch screen is that non living thing which is doing many works in our day today life with the help of a small touch. This touch screen is a simple and user friendly physical interface. This technology is applied in music players and mobile phones. The touch screen is nowadays used in many ATM machines for selecting various options specifies on the screen of the ATM machine. In the case of mobile phones a pointed material called as stylus is used for selecting various options in the touch screen. In some mobile phones having this technology the touch screen can recognize the handwriting when written using a pointed device or stylus. The touch screen works by the electrical signals. When a person touches the touch screen the electrical signal form that particular region of the touch screen is generated. The particular area where the person touches the touch screen is considered to be a button. This also implemented in personal computers for replacing the input devices such as mouse and keyboard.
