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What is the difference between polyfit and curve fitting

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Hi
What is the difference between polyfit and curve fitting ?
would you please see this page explain me these command:
modelFun = @(p,x) p(3) .* (x ./ p(1)).^(p(2)-1) .* exp(-(x ./ p(1)).^p(2));
startingVals = [10 2 5];
coefEsts = nlinfit(time, conc, modelFun, startingVals);
xgrid = linspace(0,20,100);
line(xgrid, modelFun(coefEsts, xgrid), 'Color','r');
And The Page Is:

Accepted Answer

Shashank Prasanna
Shashank Prasanna on 21 Mar 2013
I would encourage you to look at the documentation page of the functions you are you using to get a better idea of what each function is suited for.
POLYFIT:
As Matt J mentioned is used to fit polynomials
NLINFIT:
Is non linear fitting/regression for models that need not be polynomials, but can be. Go through the examples in the above links to get a better idea.
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