A vertical line of elements in a matrix is called column of a matrix.

The space inside a matrix is split as number of columns to place elements equally in each column. Every two elements in a column is separated by equal space.

Similarly, an equal space between every two columns is maintained in a matrix to avoid mixing elements of every two columns.

$\begin{bmatrix}

1 & 0 & -3 & 2 \\

4 & -7 & 7 & 5\\

-3 & 0 & 2 & -1\\

\end{bmatrix}$

- The vertical line of elements $1,$ $4$ and $-3$ is called the first column of matrix.
- The vertical line of elements $0,$ $-7$ and $0$ is called the second column of matrix.
- The vertical line of elements $-3,$ $7$ and $2$ is called the third column of matrix.
- The vertical line of elements $2,$ $5$ and $-1$ is called the fourth column of matrix.

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