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A CDN (Content Delivery Network) is a large distributed system of servers deployed in multiple data centers across the internet (usually in a variety of different countries) used to both reduce the load on any single server and serve content to end-users with increased speed, redundancy and performance.
A WordPress theme that inherits the functionality of another theme, known as the parent theme.
A feature of weblogs that allows readers to respond to posts by leaving a comment, which, if approved by the author, will be displayed underneath the content of the blog post.
The text, images, videos or other information contained within the website, typically within the website’s posts and pages.
The main files that make up the WordPress software, excluding the plugins and theme files.
A CMS (Content Management System) is a system for creating and managing online content.
CSS (Cascading Style Sheets) is a computer language used to express the presentation (layout, dimensions, colors, etc) of structured documents (usually written in HTML). Bascially, CSS tells the browser how to display the content that makes up each webpage. Read more about CSS on Wikipedia.