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People in Britain send cards to each other for lots of  reasons. More cards are Christmas than at any other time of the messages as each person sends an  average of 20 cards to relations, friends and business colleagues. Families decorate the houses with the cards, which have pictures of the countryside in winter religious scenes or  photographs of animals. People do not usually write messages on the cards and just write their names. The next most popular cards are for people's birthdays . Birthday cards for children special  show the age of the child and may show pictures of cartoon animals or of famous footballers. They have a  short poem or greeting inside and a space for the sender to  write a personal message. People also send cards on other  famous occasions. for example a wedding, the birth of a baby, a get well soon  wish to someone who is  ill or in the hospital and 'good luck' cards for people about to take examinations or driving tests. Yes. greetings cards are big business and their producers make big profits.