Elementor is a website builder platform for professionals on WordPress.
Gravatar is a service for providing globally unique avatars.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
NitroPack creates optimised HTML cache for fast page loading experience.
WP Engine is a website hosting provider.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.