Habitable zone, also known as Goldilock area (galactic habitable zone around a star), is the region around a star in which planetary mass objects with sufficient atmospheric pressure could support liquid water on their surfaces.
While it is estimated that there are at least 40 billion planets the size of Earth that are in orbit the Milky Way - our galaxy.
This particular discovery size planet Earth is labeled as such, as found in the habitable zone of another star.