The Site Language Component is for controlling content visibility based on the site’s language.
Here you select whether the site’s language should be equal to or not equal to the selected languages.
Here you select the site language.
Here you can see the selected language code.
What is Site Language?
The site language can be changed in your WordPress admin Settings menu or on the front-end of your website via a language-switcher. There are two common plugins for adding language-switching functionality to your website, these are Polylang and WPML.