What does it mean when there is a comma inside an array declaration? e.g. float[,]

Question

I have some code I\'m trying to understand while learning C#. I do not understand what I even need to search Google for to get here, but the code is as follows:

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Answer 1

It means it is a multidimensional array.

See MSDN.

Answer 2

That the array is multi-dimensional - two-dimensional in your case.

Answer 3

That would be a two-dimensional array. You can also specify more dimensions:

Multidimensional Arrays (C# Programming Guide)

Answer 4

Each comma adds an additional dimension to the array [,] = 2 dimensional [,,] = 3 dimensional ...