Data file system is the storage of document or other information into computerize. It can separate data files by type of job or by performing tasks such as data files of employee, data file of customer and data file of payroll and so on.
Data file structure consists of plenty of record. Each record consists of field, and field consists of group of “characters” and/ or “number” meaningfully. Some data consists only group of “characters” such as first name, last name.