| A touch screen is a display that is sensitive to human touch, allowing a user to interact with the applications by touching pictures or words on the screen. Although touch screens provide a natural interface for computer novices, they are unsatisfactory for many applications because the finger is such a relatively large object. | 
    
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| A stylus is an input device used to write text or draw lines on a surface as input to a handheld device. A handheld device equipped with a writing area and a stylus needs a handwriting recognition function, but existing systems do not yet have a satisfactory recognition rate. Graffiti was the most popular writing software. | 
    
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| Speech recognition technology understands human speech and speech synthesis technology is used to read text aloud. | 
    
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     Give me a beer.      I am having one for the road (a final drink before leaving).  |