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Very very basic question about Mathematica expressions


Hi,

I find that I don't understand a very basic thing about the building 
blocks of Mathematica.

When the first command is

s = x + h

I figured that (string?) "s" represents (string?) "x+h".

This theory pans out when one tries

s^2

or

D[s, x]

or

Integrate[s, {x, 0, h}]

and

s /. h -> 1

But then by doesn't this work:

Manipulate[ Plot[s, {x, 0, h}], {h, 0.1, 1}]

Many thanks in advance!


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