Websites hosted in cPanel by default is configured to display the index of a directory whenever DirectoryIndex files such as index.html or index.php are not present. This is due to mod_autoindex for Apache which is installed and enabled by default.
You can prevent Apache from displaying the directory content by using -Indexes directive or by using .htaccess file, or, you could disable mod_autoindex entirely.
mod_autoindex Apache module in cPanel can be disabled from the dashboard.
Click on the folder icon to browse the directory and click on the folder name to select the particular directory.
public_html is the root of the web folder and selcting it will apply the setting to all the subsequent subfolders. Some hosting also has www which is just a softlink to public_html so effectively they're both the same directory
What happens in the background is cPanel will append the following line to the folder's .htaccess file to disable directory listing.
New .htaccess file will be created if it doesn't already exist.
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