A personal letter is a type of letter which provides communication between a small number of people, usually two. There are many types of personal letters and they are written for a wide variety of reasons:
One person wishes to attain information from an individual or a business.
One person wishes to tell somebody about themselves, as in pen pals.
One person wishes to communicate with an acquaintance - friend or family, for example in order to maintain and reinforce the bond between them.
Surviving personal letters are often an important source of information about the lives of historical figures.