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Questions about the default file manager, Files (also known as Pantheon Files), which can be used to perform all file management tasks, including accessing the entire file system.
default email client in elementary OS (formerly known as Geary)
the elementary OS app for entering text commands, formally known as Pantheon Terminal. For the Ubuntu terminal, use "gnome-terminal".
For all questions relative to application or system performance issue.
Permissions limit the users and groups that can access, write, and execute a file.
The default photo viewer application on elementary OS. Formerly known as "Shotwell".
elementary OS's default dock. It shows active applications and is usually found at the bottom of the screen.