Today also happens to be Ash Wednesday, which begins the forty-day period day Lent in the liturgical calendar. Ash Wednesday is celebrated by many denominations, including Catholics, Anglicans, Methodists, and even some Baptists. Ashes are placed on the foreheads of the celebrants in the shape of a cross, hence the name. The ashes are traditionally from the palms from the previous Palm Sunday after they were burned. As Lent is a period of repentance and fasting, the ashes symbolize sorrow for the sins committed.
As I said, Lent is a period of fasting, though few people actually fast for forty days. Generally Christians who take part in Lent abstain from meat on Fridays and give up some favorite thing, a favorite food or habit.
Ash Wednesday is a movable fast because always occurs forty-six days before Easter which is also movable.The forty days are a reminder of the forty days Jesus spent fasting in the desert before beginning his public ministry. Lent ends on Holy Thursday, the day before Good Friday.