Answer
The graph does not represent a function.
It fails the vertical line test.
Work Step by Step
According to the vertical line test, if we draw a vertical line through any point on the graph, the line will only go through one point on the graph, meaning that there is only one $y$ value for every $x$ value.
Note that a vertical line such as $x=0$ will pass through two points on the given graph
Thus, the graph fails the vertical line test which means the graph does not represent a function.
