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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“Slavery is founded on the selfishness of man’s nature—opposition to it on his love of justice. These principles are in eternal antagonism; and when brought into collision so fiercely as slavery extension brings them, shocks and throes and convulsions must ceaselessly follow.”
—Abraham Lincoln (1809–1865)