A filename extension is a suffix (separated from the base filename by a dot) to the name of a computer file applied to indicate the encoding (file format) of its contents or usage. Examples of filename extensions are .png, .jpeg, .exe, .dmg and .txt.
Some file systems limit the length of the extension (such as the FAT file system (without Long filename support) not allowing more than three characters) while others (such as NTFS) do not. Unix filesystems accept the separator dot as a legal character.
Read more about Filename Extension: Usage, Improvements, Command Name Issues, Security Issues, Alternatives
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“The motive of science was the extension of man, on all sides, into Nature, till his hands should touch the stars, his eyes see through the earth, his ears understand the language of beast and bird, and the sense of the wind; and, through his sympathy, heaven and earth should talk with him. But that is not our science.”
—Ralph Waldo Emerson (1803–1882)