Difference between InvariantCulture and Ordinal string comparison

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When comparing two strings in c# for equality, what is the difference between InvariantCulture and Ordinal comparison?

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It does matter, for example – there is a thing called character expansion

var s1 = "Strasse";
var s2 = "Straße";

s1.Equals(s2, StringComparison.Ordinal);           //false
s1.Equals(s2, StringComparison.InvariantCulture);  //true

With InvariantCulture the ß character gets expanded to ss.

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