Congratulation messages are messages sent to people to congratulate them and wish them. You congratulate people when they accomplish some big feat or when they have some good news in store for everyone. Congratulation messages are not only sent to wish someone on accomplishing some special feat, but generally, also on occasions when someone has bought a new house, someone has been blessed with a child etc. We congratulate people when their happiness becomes manifold because of some or the other reason.
Congratulation messages can vary largely in the way they are written and sent across to someone else. You congratulate in simple one-liners via text messages. You can also write congratulation messages in a mail, greeting card, e-card etc. and sent them across to people whom you wish to congratulate. Congratulation messages also make the other person whom we congratulate feel extremely elated for being acknowledged. Congratulate someone when you feel that they do deserve it.