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=== Extensions ===
Many operating systems use an ''extension'' at the end of a filename to denote the type of data stored in the file. These extensions are written as delimited by a period followed by one or more characters. For example, in the filename:
ops102_project.pdf
The extension is "pdf", denoting a file in Portable Document Format.
It is unusual to use multiple extensions on a Windows system, but not uncommon on a Linux (or other Unix-like) system.
For example, on a Linux system, the filename
backup.tar.gz
has two extensions, "tar" indicating a archive created with the <code>tar</code> command, and "gz" indiciating that the file was compressed with the <code>gzip</code> command.
=== Case Sensitivity ===