What is flat file? - Definition from WhatIs.com
A flat file contains records that have no structured interrelationship. A flat file typically consists of a text file, from which all word processing or other structure characters or markup have been removed. A flat file is often mistaken for a relational database, but they are actually much different.
https://searchsqlserver.techtarget.com/definition/flat-file
Seonglae Cho