What is the difference between the Gregorian calendar and the Julian calendar

The difference between the two calendars is very small, and in a human life they are not noticeable, but on the long run there some differences.

The Julian calendar has one year as 365.25 days, but the problem is that it is 11 minutes less, and it also has a leap year on every year that is dividable with 100.

The Gregorian calendar, on the other hand, has one year as 365 days, and it has a leap year on every year that is dividable with the number four, so it is slightly more accurate.

Most of the countries nowadays are having the Gregorian calendar in usage.