A row of a matrix is a **zero row** if it contains only zeros. For example, $[0\ 0\ 0\ 0\ 0]$ is a zero row.

A row of a matrix is **non-zero**, or a **non-zero row** if contains at least one entry that is not $0$. For example $[0\ 0\ 3\ 0\ 0]$ is non-zero, and so is $[1\ 2\ 3\ 4\ -5]$.