A matrix (array of values) with the same number of rows as columns.

Matrix "A" has 3 rows and 3 columns (it is a 3x3 matrix), so it is a square matrix:

Matrix "B" has 4 rows and 4 columns (it is a 4x4 matrix), so is also a square matrix:

Matrix "A" has 3 rows and 3 columns (it is a 3x3 matrix), so it is a square matrix:

Matrix "B" has 4 rows and 4 columns (it is a 4x4 matrix), so is also a square matrix:

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