Question

what is leap year explain

Answer 1

(For example, 2016 divided by 4 = 504: Leap year!) 2. Exception: Century years are NOT leap years UNLESS they can be evenly divided by 400. (For example, 1700, 1800, and 1900 were not leap years, but 1600 and 2000, which are divisible by 400, were.)

Answer 2

A leap year is a year having 366 days instead of 365 days. Our earth takes 365 days and 6 hours to take 1 revolution around the sun.
Therefore after 4 years the extra hour take one day which is added to year.
Hence, it is leap year.

Hope it helps you.