Ash Wednesday marks the beginning of the season of Lent. It is a season of penance reflection and fasting which prepares us for Christ's Resurrection on Easter Sunday. We put ashes on our foreheads as a sign of our identity as Christians. The ash which we use on Ash Wednesday comes from burning the palms used on Palm Sunday last year. It is placed on our foreheads in the sign of a cross.
For more information on Lent visit:
http://www.bbc.co.uk/religion/religions/christianity/holydays/lent_1.shtml