What is Child Theme?

A child theme is a theme that inherits the functionality and styling of another theme, called the parent theme. Child themes are the recommended way of modifying an existing theme. The benefits of working off a parent theme means you don’t need to write all the HTML/CSS from scratch. A child theme will automatically use any template files you include, such as sidebar.php or footer.php. But if they are missing, then your child theme will pull the same files from its parent.