Dear Friends, Hope you all aware about extensions used in various file formats such as .jpg, .mp3, .exe, etc,.
A filename extension is a suffix (separated from the base file name by a dot) to the name of a computer file applied to indicate the encoding (file format) of its contents or usage.
Filename extensions can be considered a type of metadata. They are commonly used to imply information about the way data might be stored in the file. The exact definition, giving the criteria for deciding what part of the file name is its extension, belongs to the rules of the specific filesystem used; usually the extension is the substring which follows the last occurrence, if any, of the dot character.
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