Parsec is a unit used to measure _______?

Distance (specifically, extremely large astronomical distances to objects outside our Solar System).One parsec is equal to about 3.26 light-years (or roughly 19 trillion miles / 31 trillion kilometers). The term is a blend of "parallax" and "arcsecond," and is defined as the distance at which the radius of Earth's orbit subtends an angle of one arcsecond.