Answer
$\text{domain: all real numbers}
\\\text{range: }
\{y|y=5\}
$
Work Step by Step
The $x-$values of the given graph can be any number, while the $y-$ value is always $5$. Hence, the graph has the following characteristics:
\begin{array}{l}
\text{domain: all real numbers}
\\\text{range: }
\{y|y=5\}
.\end{array}