For this reason large numbers of applicants often compete for the same jobs. However, you can make your application stand out against the competition. Open ads contain the name of the company and, on average, draw the largest number of candidates. The typical open ad may generate hundreds of responses. Blind ads are those that require you to respond to a post office box without disclosing the employer's name.
Companies run blind ads mainly for confidentiality, to prevent people from applying in person.
But employers may place a blind ad for strategic reasons as well. For example, competing companies carefully watch classified ads to determine if competitors are expanding services, opening offices in new geographic areas, or expanding into new areas of business. Running a blind ad prevents disclosing such information to competitors. A company may also choose to run a blind ad if they are thinking of replacing an employee. This enables them to identify a successor before terminating the current employee.