A horizontal line of elements in a matrix is called row of a matrix.

The space inside a matrix is divided as number of rows to place elements equally in each row. Every two elements in a row is separated by equal space.

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

$\begin{bmatrix}

-4 & 1 & 0 & 9 \\

7 & 3 & -8 & 5\\

2 & -5 & 1 & 0\\

\end{bmatrix}$

- The horizontal line of elements $-4,$ $1,$ $0$ and $9$ is called the first row of matrix.
- The horizontal line of elements $7,$ $3,$ $-8$ and $5$ is called the second row of matrix.
- The horizontal line of elements $2,$ $-5,$ $1$ and $0$ is called the third row of matrix.

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