What is "wordpress-theme"

Wordpress themes control the appearance and presentation of the site content. They are a collection of files that produce the website’s graphical interface with a unified design. These files are called Template Files. A theme modifies the way the site is displayed, without modifying the software or data it manages.

Themes can include custom template files, image files (*.jpg, *.gif), style sheets (*.css), custom pages as well as any code files needed (*.php, *.js etc.).

It is necessary to follow the Hierarchy of Wordpress Templates in the construction/management of themes, as it determines which files are used to display which contents. For example, category.php shows the list of posts in the accessed category, tag.php shows the listing of posts of any tag accessed etc.

For more see the article Using Themes in the Codex.

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