Google AdSense is a program run by Google through which website publishers serve advertisements that are targeted to the site content and audience.
OpenResty is a web platform based on nginx which can run Lua scripts using its LuaJIT engine.
WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. Features include a plugin architecture and a template system.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.