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Some days were added to certain months, and the total number of days in the year went to 365 from 354. Every fourth year was made a leap year, with an extra day in one month. But there was still a discrepancy between the true year and the Julian calendar year.
A common year consists of 365 calendar days as opposed to a leap year which has 366 days. A Leap Day is added nearly every 4 years to the Gregorian calendar. However, a Leap Day is not added EVERY 4 years - 3 criteria need to be met. See when is Leap Year for additional critia.