What are the data files used as input for an information system?

Data files used as input for an information system typically include databases, spreadsheets, and flat files that contain structured or unstructured data. These files can consist of various formats such as CSV, XML, JSON, or proprietary formats specific to certain applications. Additionally, data can be sourced from external APIs, sensor data, and user-generated content. The input data files are essential for processing, analysis, and generating insights within the information system.