Theme
The package of templates and styles that controls how a WordPress site looks: layouts, fonts, colors, headers and footers.
A theme controls the design of a WordPress site: page layouts, typography, colors, header, footer and how content is displayed. Your content (pages, posts, images) lives separately in the database, so in principle you can change themes and keep your content.
Many sites use a child theme, a small layer of customizations on top of a parent theme, so the parent can be updated without losing those changes.
Theme vs plugin
A theme decides how things look. A plugin adds features. Some themes include lots of features too, which can make switching themes harder later.
Why it matters to a small business
- Speed. A lightweight theme helps pages load fast. Some feature-packed themes load a lot of code on every page.
- Updates. Themes need updates for security and compatibility, just like plugins. A theme its developer has abandoned becomes a growing risk.
- Flexibility. Some themes depend heavily on a page builder or bundled plugins. That’s fine until you want to change.
- Accessibility. The theme affects color contrast, keyboard navigation and heading structure. See WCAG.
Modern “block themes” work with the WordPress block editor and let you edit headers, footers and templates visually.
Example
A nonprofit’s theme was bought years ago and hasn’t been updated since. It shows warnings with newer versions of PHP and WordPress. Rather than patching it, they plan a refresh on a maintained, lightweight theme, built on a staging site first.
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