People might think our skin is the organ of the sense of touching. However it is the sensory receptors that does the job, there are more than 4 million of these things in our skin. This system detects experiences such as touch or pressure, temperature (that;s why we feel cold), pain, itch, tickle, etc... When someone touches something, we get perception of the pressure, therefore we can make out what is the object we are touching, like texture, shape, etc...
When we touch, signals go through things called neurons to the brain. Which the brain determines what we are touching, telling us what we are feeling and how it feels. If we get burnt by flame, the signal is too urgent to be sent to the brain, but stops half way at the spinal cord. This gives a fast reaction, moving away from the thing that is hurting us.
Source: http://www.wikipedia.com/ http://www.askjeeves.com/ http://www.answerbag.com/
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