A child theme, whether in WordPress or any other content management system, is a theme that inherits the functionality and styling of another theme, referred to as the parent theme.
It allows you to make modifications to the design and functionality of your site without affecting the original (parent) theme.
This is useful for customizing your site while preserving the ability to update the parent theme without losing your changes.
Child themes typically include a style.css file and can contain template files that override those in the parent theme.