Questions about text editors in general (i.e. programs used for editing plain text files).
Text editors are often provided with operating systems or software development packages, and can be used to change configuration files and programming language source code.
For programs to edit formatted text, see word-processing. For batch processing of text files, see text-processing. For questions about a specific editor, use the relevant tag: emacs, gedit, kate, kwrite, nano, vi, vim, …