Differences between official and semi-official letters

What are the differences between official and semi-official letters?

Difference between official and semi-official letters is as follows:

Subject	Official letters	Semi-official letters
1.Definition	When letters are written on official matters then it is known as official letter.	When a letter conveys both official and personal information in the same time then it is known as semi-official letter.
2. Tone	Tone of an official letter is formal.	Semi-official letters follow an informal tone.
3.Structure	It follows specific structure.	Specific structure is not followed.
4.Salutation	Depends on the designation of the receiver.	Salutation depends on the personal relationship between sender and receiver.
5.Reference number	Reference number is used in an official letter.	Use of reference number is not required.
6.Length	Length of an official letter is normally short.	Length of semi-official letter is larger than that of an official letter.
7.Enclosure	Necessary documents can be enclosed.	Enclosure is not required.
8.Number of receiver	Number of receiver may be more than one.	Number of receiver is one.

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