Answer
This is the plane that intersects the $y$-axis at $y=-2$ and is parallel to $xz$-plane.
Work Step by Step
This region is the set of all points $(x,y,z)$ that satisfy the equation $y=-2$. So this is the set of all points with $y$-coordinate equal to -2.
We know the $xz$-plane is the set of all points $(x,y,z)$ with zero $y$-coordinate, so we can obtain our region by shifting each point in the the $xz$-plane 2 units in the negative $y$-direction.
Hence our region is the plane that intersects the $y$-axis at $y=-2$ and is parallel to $xz$-plane.
