Define square matrix with examples?

A square matrix is a matrix that has the same number of rows and columns. In other words, it is a matrix with dimensions n x n, where n is the number of rows and columns.

Examples of square matrices:

1.
\[
\begin{bmatrix}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9 \\
\end{bmatrix}
\]

2.
\[
\begin{bmatrix}
-2 & 0 \\
0 & 4 \\
\end{bmatrix}
\]

3.
\[
\begin{bmatrix}
10 & 20 & 30 & 40 \\
50 & 60 & 70 & 80 \\
90 & 100 & 110 & 120 \\
130 & 140 & 150 & 160 \\
\end{bmatrix}
\]