📁 File Format Identification Quiz

Think you know your .csv from your .json? Put your format knowledge to the test!

About This Quiz

This quiz will test your knowledge of common file formats, their extensions, and typical uses. You'll encounter 15 multiple-choice questions covering formats like .csv, .json, .xml, .mp4, and more.

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Quick Tips

Look at file extensions (.csv, .json, etc.)
Consider the typical uses of each format
Think about the structure of the data
Watch for keywords like "structured", "binary", or "markup"

File Format Reference

Extension	Type	Common Use
.csv	Text	Tabular data in spreadsheets
.json	Text/Structured	Web APIs, data exchange
.xml	Text/Structured	Markup for data, config files
.mp4	Media	Video files
.html	Code	Web page markup
.css	Code	Styling web pages
.pdf	Document	Printable documents
.exe	Binary	Executable programs (Windows)
.png	Image	Lossless image format
.zip	Archive	Compressed files/folders

How to Identify File Types

Clue	What It Means
Starts with { or [	Likely a JSON file
Contains tags like <div>	Likely HTML or XML
Commas per line	Likely a CSV
Ends in binary	Likely EXE or compiled format
First bytes are %PDF	PDF document
Contains ID3 tag	MP3 audio file

File Format Glossary

JSON

JavaScript Object Notation – a format for structured data (key-value pairs).

CSV

Comma-Separated Values – plain text format for tabular data.

HTML

Hypertext Markup Language – builds the structure of web pages.

MP4

MPEG-4 Video format – used for streaming and storage.

PDF

Portable Document Format – preserves document formatting.

XML

eXtensible Markup Language – markup language for structured data.

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