What purpose do you think the Bayeux tapestry served?

The Bayeux Tapestry is really an embroidery but the word tapestry has stuck. It is now on permanent public display in the city of Bayeux in Normandy, France. It tells the story of the Battle of Hastings; why William felt he had to invade, the preparations made for the crossing and the battle itself. Tapestries were not rare in the time of William but the size of this particular tapestry is an indication that it was important. The story it tells was to have a huge impact on Medieval England