What is the Significance of dx in Integrals?

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What is dx mean in intagral?
 
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that x is the variable that you perform the integral over. Variable of integration.

It comes from the defintion of integral, that you sum over the function value multiplying it with a very very small x-intervall (length multiplied with height). Riemann summary. If we make the intervall infinitesimal (dx), the we have to do, in practice, an infinite amount of summations over these "function value" * "length of intervall"

http://en.wikipedia.org/wiki/Integral
 

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