There are two kinds of letter of introduction: personal introductory letter and official letter of introduction.

Personal introductory letters are written letters to third friends and relatives.

The official letter of introduction is a letter writer who introduces his colleague or business relationship to a unit or individual on the basis of official information.

This kind of letter of introduction is relatively strict in language and format, and it should not be long.

Generally, there are:

A brief introduction of the identity and situation of the referee;

Explain the reasons and ask the other party to give some help to the referee.

Thank you for your help.

If your partner is an old friend or an old friend, you can ask questions about your work or greet your partner.

The two letters of introduction can be sent either by mail or by referral.