What is a characteristic of a CSV file?

A CSV (Comma-Separated Values) file is specifically designed to store data in a structured format, making it easy to read and write for both humans and machines. The key characteristic that makes option C correct is that a CSV file uses commas to separate values, allowing it to organize data into rows and columns. This structure is particularly useful when importing or exporting data into and from spreadsheet applications, databases, or other data processing tools.

The .csv file extension is a widely recognized standard that indicates the file format to users and software applications. This identification is crucial because it signals to both the system and the user what type of data format they are working with. The organization of data into columns allows for clear and logical organization, which enhances data management and analysis.

While options like using semicolons, the requirement for specific database systems, and the limitation to only numeric data may pertain to other file types or scenarios, they do not apply to the standard format and versatility of CSV files. CSV files can indeed hold diverse types of data, including numbers, text, and dates, making them incredibly flexible for various applications.