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Glossary of Computer and Internet Terms
A glossary of computer and Internet terms with definitions that are easy to understand.
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File Extension

A File Extension is a letter code at the end of a file name that shows what type of file it is. The code .txt shows that it is a text document. The majority of file extensions are three characters long however they can be one to five long. A file extension will also provide information to the computer about which operating system should be used to open it.