jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
Lightbox is small javascript library used to overlay images on top of the current page.
LiteSpeed is a high-scalability web server.
WP Rocket is a caching and performance optimisation plugin to improve the loading speed of WordPress websites.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.