Informal Letter To Friends. A letter to a friend falls under the category of informal letters. There is no fun if you go on a trip without your friends.
Like other people, i have many friends including school or university friends. After a long time, friendship letter to a new friend, sample loan application letters between friends, encouraging letter. By writing this letter to your friend you can ask him to go on a trip with you.
One more example of this letter is also available here.
Note that in informal letters, we address people by their first names. Example of an informal letter to invite a friend for summer vacation. As you can see from the letter the tone is quite informal and relaxed. However, we are more used to writing formal letters.