This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Formal Letters: are letters to peoples who we don't know on a personal level.
For example:we may write to find out information,to apply for a job,to make a complaint etc.
Informal Letters:An informal letter is a letter you would write to a friend, a family member or an acquaintance. The classic informal letter has five parts as follows: 1. Address Block. Includes your return address and the date of writing the letter.