Google Analytics is a free web analytics service that tracks and reports website traffic.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.
Site Kit is a one-stop solution for WordPress users to use everything Google has to offer to make them successful on the web.
WPML plugin makes it possible to build and run fully multilingual WordPress sites.