NOCTI Commercial Art Practice Test

What term describes the 3-4 letter suffix at the end of a document name (for example, PSD)?

Document Type File Extension File Format Version Number

Correct Answer:

File Format

Explanation:

The 3-4 letter suffix at the end of a file name is called the file extension. This extension identifies the file type to the operating system and applications, helping them know how to open and handle the file. In your example, PSD indicates a Photoshop Document, so the extension tells software that it’s a Photoshop file and what kind of data it contains. File format is related but refers to the actual structure or encoding of the data inside the file. The suffix you see on the filename is specifically the extension, which is the label used by systems to recognize the file type. Examples of other extensions include .docx, .jpg, and .png.

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