Your Curriculum Vitae must be accompanied by a covering letter. It has two main objectives: to attract the interest of the person who receives it, so that he/she will read the curriculum more carefully, and to highlight those aspects of the curriculum that best fit the required profile.
In the following links you can find information on how to write your covering letter.
Advice to write a covering letter
There are several types of covering letters depending on their purpose: of promotion, of follow up or reminder of the interview, of gratitude for the interview granted, of refusal of a job offer... The more known and used ones are:
And do not forget that in the Occupational Guidance Area you can find personal service and advice whenever you wish to design and prepare your curriculum.