Another theme will inform to the WordPress parent theme, is the child theme. This feature in WordPress provides designers & developers to take advantage of more extensive ability by creating a child theme. A Parent theme carries along with all its functionality, features, and style to the child theme. The child theme can selectively make changes into the functionality of the main theme externally ever changing the parent theme.
The parent/child theme functionality provides users to easily upgrade their themes, without worrying about losing any custom styling that they have continued to their site.
Often beginners confuse parent themes with theme frameworks. All WordPress theme frameworks are parent themes. But, not all parent themes are theme frameworks. In theory, all WordPress themes can be a parent theme of the site. For a parent theme to be a framework, it needs to give the ability for developers to modify and customize the core functionality of the theme without changing any of the core files. This is normally done by using hooks and filters.
We recommend users to create child themes when you want to have custom styling. However, if you are deciding to go beyond the necessary CSS changes and want to add tons of new functionality. Then we suggest that you use a proper theme framework for building a child theme.