Mardi Gras is a traditional celebration that takes place in many countries around the world. It is celebrated on the Tuesday before Ash Wednesday, which marks the beginning of LENT. The term Mardi Gras is French for 'FAT Tuesday, ' and it is a day of feasting and merrymaking before the fasting of LENT begins. The celebration is often marked by parades, costumes, and MASKS. The King of Mardi Gras is known as REX, and his costume is usually made up of purple, green, and gold. People often wear MASKS to hide their identity and join in the festivities.