Mardi Gras celebrations are currently underway in many cities across the world.
The festival, held just before the onset of Lent for Christians, features jubilant parties and colorful parades, the most famous of which is held in New Orleans. The famous Brazilian Carnivals are also held this time of year and share many similarities to Mardi Gras.
But what exactly is Mardi Gras? Here's everything you need to know about what it is, when it is, what Fat Tuesday is and when Fat Tuesday 2018 is.