A birthday letter is a form of an informal letter. Birthday letters are of two types. One is written to send greetings to the loved ones on their birthday. These are known as birthday greeting letters. The second type involves inviting the loved ones to the upcoming birthday party. These are called birthday invitation letters. These letters can be written by a family member, friend, or a close associate. As birthday letter is an informal letter, its format is flexible and the language is casual. Moreover, birthday letters are usually handwritten. Unlike formal letters, there is lot of scope to use different colors, different calligraphic styles, pictures, etc.
Birthday is a very special moment in an individual's life. Hence, birthday letters should express warmth and happiness.
