A hack is a bit of code written to customize or extend the functionality of a software product. Older versions of WordPress used a hack-based extension system, but versions 1.2 and above of WordPress use a Plugin API with hooks for extensions.
- See also: Hacking, Plugin
- Related articles: Changelog, Hacking WordPress, Plugin API
- External links: Open source at Wikipedia
Reference https://codex.wordpress.org/Glossary