What is a WordPress theme

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The WordPress theme for site visitors is its look and feel. For the system, a WordPress theme is a set of files that allow you to create a graphic design for the appearance of a WP site.
The theme includes the following files:
php codes (* .php),
cascading style sheets (* .css),
pictures (* .gif, * .jpg,).
The WordPress theme is designed in such a way that it allows you to change the appearance of the site without changing the site's software code. A WordPress site can easily change its theme without changing the content of the site. If this seems complicated to you, then you are better off using wordpress themes customization services https://www.psd2html.com/wordpress-development.html from psd2html specialists