PHP is a scripting language used for web development and is used in Wordpress websites. It's a coding language that gets updated regularly and can impact your site's functionality if not updated by a developer.
Depending on your site's build and the plugins you use, updating the PHP of your site may require additional changes to your site's code.
You can find more information on PHP here.
If you aren't sure whether you should update the PHP version of your Website website, or you need help in performing the update, you can contact our Customer Success team here.