A child theme in WordPress is a theme that inherits all the functionality, features, and styling of its parent theme. It is a recommended method to customize or modify an existing WordPress theme without losing the ability to update the parent theme.
In WordPress, a child theme is used as a safe method to modify or customize the theme without actually changing any code to its parent theme.
A child theme works by referencing the parent theme, and any modifications made in the child theme will override the parent theme. This allows you to modify the look and functionality of your website while still retaining the underlying functionality and security of the parent theme.
Child themes are particularly useful when you want to make minor modifications to a theme, such as changing the colors, fonts, or layouts, without having to create a completely new theme from scratch. By using a child theme, you can also avoid losing your modifications when the parent theme is updated.