What is the function of the resume?

It is used as the basis of consideration for the employers to decide whether or not you are suitable for the job.

To discharge the legal obligations for payment from the buyer to the seller, by having a bank pay the seller directly.

To help explain a specific subject and to help the audience remember the knowledge later. It depends on the information.

Provides the recipient with a specific context in which to place the larger document and simultaneously gives the sender a permanent record of having sent the material.

The letter is written about someone, and are therefore addressed to a particular requester, although they may also be issued to the person being recommended without specifying an addressee.