cdnjs is a free distributed JS library delivery service.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Internet Information Services (IIS) is an extensible web server software created by Microsoft for use with the Windows NT family.
MonsterInsights is the most popular Google Analytics plugin for WordPress.
PHP is a general-purpose scripting language used for web development.
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.