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A theme is server code :) Since WordPress is PHP, rendering the front end is done in PHP on the server. A theme writes PHP to render custom templates, which (on
by noahtallen 5y ago
A theme is server code :) Since WordPress is PHP, rendering the front end is done in PHP on the server. A theme writes PHP to render custom templates, which (on top of styles) is a large part of what themes do in WordPress.
This is changing to an extent with the Full Site Editing project, but themes and plugins are both very powerful and flexible in WordPress, which has in part led to its massive success.