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
Famous quotes containing the word extension:
“We know then the existence and nature of the finite, because we also are finite and have extension. We know the existence of the infinite and are ignorant of its nature, because it has extension like us, but not limits like us. But we know neither the existence nor the nature of God, because he has neither extension nor limits.”
—Blaise Pascal (1623–1662)