what is the difference betweeen informal and formal letter?

Formal letters are written to important people like boss editor for an important work. Eg a 3 day holiday permission from your boss
Informal letters are written to friends and relative for any informal purpose. Eg sharing your experience in a foriegn place with your distant friend

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formal letter is given to the principal school teacher and stuff
 
informal letter can be give to far members of your friend , family etc.
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is it correct
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In formal letter it means writing a letter to any important or a executive person
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In informal letter writing a letter to any friend or a relative
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