In computing, a hidden folder (sometimes hidden directory) or hidden file is a folder or file which filesystem utilities do not display by default when showing a directory listing. They are commonly used for storing user preferences or preserving the state of a utility, and are frequently created implicitly by using various utilities. They are not a security mechanism because access is not restricted - usually the intent is simply not "clutter" the display of the contents of a directory listing with files the user did not directly create.
The Android OS, itself derived from Linux, uses empty .nomedia files to tell smartphone apps not to display or include the contents of the folder. This prevents digital photos and digital music files from being shown in picture galleries or played in MP3 player apps. This is useful to prevent downloaded voicemail files from playing between the songs in a playlist, and to keep personal photos private while still allowing those in other folders to be shared in person with friends, family, and colleagues. The .nomedia file has no effect on the filesystem or even the operating system, but instead depends entirely on each individual app to respect the presence of the different files.
The Android OS, itself derived from Linux, uses empty .nomedia files to tell smartphone apps not to display or include the contents of the folder. This prevents digital photos and digital music files from being shown in picture galleries or played in MP3 player apps. This is useful to prevent downloaded voicemail files from playing between the songs in a playlist, and to keep personal photos private while still allowing those in other folders to be shared in person with friends, family, and colleagues. The .nomedia file has no effect on the filesystem or even the operating system, but instead depends entirely on each individual app to respect the presence of the different files.
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