Final answer:
Master files consist of records with a consistent structure and fields, but the data within them can vary for each individual entry.
Step-by-step explanation:
Master files contain permanent records. If you compare two records in the same master file, you find that the structure and fields are the same, but the contents or data can be different.
Each record in a master file is made up of fields that are designed to contain specific pieces of information. These fields follow a specific format or structure, which remains consistent across all records. However, the content within these fields, such as values or specific data entries, will differ from record to record to reflect the nuances of each individual entry.