What is the meaning of "dx" in indefinite integral?

Question

moongazer · Answer

$$\int\limits_{}^{} f(x)dx=F(x) + c$$
My book says it is the variable of integration.
What does that mean?
Is it different from the dx in differentials which means delta x?

ash2326 · Answer

it's the same, change in x or delta x. It also indicates that f(x) is integrated with respect to x

moongazer · Answer

Thanks :)
Could you explain to me what is the difference of derivative and differential?
I already know that the derivative is the slope of the line tangent to a  point on a function.
But I am having trouble explaining the meaning of differential.

moongazer · Answer

@ash2326

ash2326 · Answer

@moongazer I have also superficial knowledge about this. Please refer this http://math.stackexchange.com/questions/23902/what-is-the-practical-difference-between-a-differential-and-a-derivative

moongazer · Answer

ok, Thanks :)
I'll read it