HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
MailChimp for WordPress is an email marketing plugin that enables you to build subscriber lists.
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.