Because it includes the word “year”, the term light-year is sometimes misinterpreted as a unit of time but actually it is a measurement unit of distance- we mean large, really large distances.

A light year is the distance travelled by the sunlight in 1 year. Mind that speed of light is 3 lakh km/second.  So, how big is a Light Year…!!!  Whhhoaaa..!!

1 light year = 9.4607 × 10¹⁵m ≈ 9.461 trillion km

The light-year is most often used when expressing distances to stars and other distances on a galactic scale.