When employment starts, so does the employer_employee relationship. This type of relationship is defined by the kind of contract the employee has in the company. It revolves around the things they talk about and disclose to each other before the start of the employment. And before such employment, it is necessary that the company has certain basic information about the employee. This is basically for accountability purposes and for the sake of having a complete and uniform record of all employees.
An employee form template would normally ask for the name of the person, his department or his position title. Those information are necessary so that from the list of many employees of the company, each one may be identified from the other. Part of the template would be the complete address of the employee.