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.
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.
WP Fastest Cache is one of a number of plugins for WordPress designed to accelerate the performance of your website.