The Social Security number was originally created to keep an accurate record of each individual’s earnings. Later, it also served to monitor benefits paid under the Social Security program. The Social Security number has now grown to be a general identifier for all types of record-keeping systems in the United States. Specific laws require a person to provide his or her Social Security number for certain purposes. Check out this link for a list of organizations in which a Social Security number is required or requested and additional guidelines for providing your Social Security number.