One parsec (parallax angle of 1 arcsec) is the distance at which one astronomical unit subtends an angle of one arcsecond.
A parsec is equal to about 3.26 ly (31 trillion kilometres or 19 trillion miles) in length. and it is about 2.0626×10^5 AU.
The nearest star, Proxima Centauri, is about 1.3 parsecs (4.2 light-years) from the Sun. Most of the stars visible to the unaided eye in the nighttime sky are within 500 parsecs of the Sun.
A parsec is the distance from the Sun to an astronomical object that has a parallax angle of one arcsecond (the diagram is not to scale).
NOTE: Above information has been taken from wikipedia and/or official websites of topics.
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