Lent is a season of the Christian year where Christians focus on simple living, prayer, and fasting in order to grow closer to God. It's the forty days before Easter. Lent excludes Sundays because every Sunday is like a little Easter. Basically, it's about one-tenth of a year (like a tithe of time). Mardi Gras is the day before Lent, which begins with Ash Wednesday. Mardi Gras means "Fat Tuesday." It refers to the day before Lent starts. Since Lent always starts on a Wednesday, the day before is always a Tuesday. And it's called "Fat" or "Great" because it's associated with great food and parties.
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