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Fit or Interpolate

Hello all, 

Another in a series of potentially simple questions: 

What is the difference between using Fit and Interpolation?
f[x_]=Fit[data, {1,x},x]

I do know that Fit can take arguments for the independant variables
form like:
f[x_]=Fit[data, {1,x},x]
f[x_]=Fit[data, {1,x,x^2},x]
but that's a bit of guesswork if you have a limited set of points, no?

Also, is there a function in Mathematica that allows me to swap
dependent and independent variables? e.g. x=2.5y --> y=x/2.5

Thanks much, 

David Seruyange

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