The Jubilee is a great event of the Catholic Church, celebrated for the first time in 1300 by will of Pope Boniface VIII. It is the year of the remission of sins, but also the year of reconciliation between the contenders, of conversion and of sacramental penance.
The Jubilee is also called "Holy Year", it can be ordinary or that falls on the pre-established date - every 25 years, the next one will be in 2025 - or extraordinary if called for special reasons.