about letter full description
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letter
is a written message that can be handwritten or printed on paper. It is usually sent to the recipient via mail or post in an envelope, although this is not a requirement as such. Any such message that is transferred via post is a letter, a written conversation between two parties.
Formal Letter: These letters follow a certain pattern and formality. They are strictly kept professional in nature, and directly address the issues concerned. Any type of business letter or letter to authorities falls within this given category.
Informal Letter: These are personal letters. They need not follow any set pattern or adhere to any formalities. They contain personal information or are a written conversation. Informal letters are generally written to friends, acquaintances, relatives etc.