What are themes and how do they work?

- Themes control the appearance…of your WordPress site on the front-end,…so what people see when they visit your site.…But how do they work?…Understanding the basics of theme construction…will make it easier for you to find a theme…that fits your site, and troubleshoot your theme…when things don't work as expected.…A WordPress theme is a series of…templates, style sheets, and script files…contained within a dedicated folder.…When you add a new theme to your WordPress site,…you're actually just adding a new folder…to the themes folder in your installation.…WordPress automatically recognizes the theme,…and makes it available to you.…

The templates in your theme are based on…something called the WordPress Template Hierarchy.…Now, you don't have to know how this works exactly,…you just need to know it exists.…It's a system the application uses…to pick the right template for the right type of content.…In simple terms, a theme works like this:…A browser is told to visit a URL that…points at a specific database entry.…