What is a file extension?

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A The name of a folder
B A type of computer virus
C A format that indicates the type of file
D A type of computer monitor

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Answer: C. A format that indicates the type of file

A file extension is the short code after the dot in a file name, like .docx, .jpg or .mp3. It tells the computer what type of file it is and which program should open it.

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What is a file extension?

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