WordPress Themes vs Plugins: What’s the Difference?

If you’ve ever worked on a WordPress site, you probably know that there are two main things that determine how your site works: themes and plugins. Every WordPress site has the same core features, but themes and plugins let us add new features and designs that make our particular WordPress site unique.

But what’s the difference between a theme and a plugin? Which one should you use to customize your site? The answer depends on what you want to do. If you want to change the way your site looks, you probably want a new theme. If you want to change what your site does, you may need to install a new plugin.

What’s a WordPress theme?

Every WordPress site uses a single theme. WordPress themes determine the look and feel of your website. The main purpose of a theme is to provide a cohesive design for your site, and traditionally they don’t focus on adding new features. However, as WordPress has evolved, themes have become much more robust.

Many of the most popular modern WordPress themes cross the boundary of design and add new features to your site as well. Some WordPress themes have a list of “required” plugins that must be installed for the theme to work correctly. Overall, it is much more common today to see themes that do much more than simply change the design of your site.

What’s a WordPress plugin?

Whereas themes provide the form of a website, plugins provide the function. Plugins change the way WordPress sites work, and lets them do new things. While you can only have one active theme on your site, you can have multiple active plugins. You can even combine plugins in interesting ways to create completely new site features.

There are thousands of plugins that add new features to WordPress, from creating contact forms to selling products in an online store. If you’ve ever wondered if your WordPress site could do something, chances are there is a plugin to make it happen.

Depending on what a plugin does, it may be able to adapt to your WordPress theme’s design, or it may incorporate its own stylesheet to provide a default design for new features. Some of the most popular WordPress plugins even have entire themes built specifically around them.


All the different combination of themes and plugins make for an endless possibility of unique WordPress sites. The platform is built for customization, but the wide array of options can be overwhelming. If you’re having trouble deciding on the best combination of themes and plugins to build your site, Watermelon is here to help.

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OMS Anita
22:20 29 Nov 24
Watermelon Web Works has been incredible to work with. They are patient, understanding, and quick to answer any questions (or emergencies) you might have. After switching over to them to help re-vamp our online retail store, we hired them to build our wholesale website as well. I can't recommend them enough - Thank you team!
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Garrett Lister
19:55 10 Jul 24
Jared and the watermelon team were great - they quickly interpreted our website needs and designed a wonderful site. The project management site worked great to keep track of project.
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N B
21:23 14 Nov 23
My previous web developer who I was very happy with retired and I was pretty sad about it because it seems now days it is hard to hire a web developer close by with a good set of skills who is interested in helping small business at reasonable prices. Then I found Watermelon and I have been very happy. They are responsive, are able to solve problems, and work at reasonable prices.
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Dark Star Magick
18:05 03 May 23
We hired Watermelon to help us with our website. They were very thorough and took the time to explain in layman's terms what they were doing and how we could improve SEO and site functionality. We will definitely be back for future website needs!
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Astoria Column
18:42 24 Apr 23
Great work and amazing service! We're a non-profit, and our priorities are always focused on maintaining the Astoria Column. We had a website built by someone else a few years ago, but without regular updating and maintenance, sections of our site were no longer functional. Joanna and the rest of the team came in and had everything working within a week and it's been smooth sailing since then!
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Ben Harris
19:25 26 Aug 19
Watermelon has been a fantastic web development partner. Through every phase of our project they have always been 100% responsive to our requests and have always provided highly knowledgeable, creative, prompt, and personable team members to work with. As a financial institution we’re always concerned about the security and maintenance or our website and Watermelon has always provided the appropriate resources in order to meet and/or exceed our compliance and security requirements. We would surely refer them to any business associates looking for a qualified WordPress web designer in the future. – Denali Federal Credit Union
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Mohr IP Law Attorneys
00:33 11 Apr 19
Watermelon Web Works did a great job creating a custom shopping cart page for our firm. Gavynn in particular was especially helpful and responsive. We appreciated the upfront costs and the technical competency of Watermelon Web Works and would not hesitate to work with the people there again.
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Kim Markle
23:36 08 Feb 19
Our company has been working with the Watermelon team for more than 10 years to help build and grow our website and customer portal. They are not only extremely talented and responsive, but are continuously looking for ways for us to enhance our current website. They are consistent, provide excellent customer service and really know what they are doing. Highly recommend!
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Rick Brodner
23:23 12 May 17
I cannot say enough good things about Watermelon. They are terrific communicators, highly competent coders, and really, really nice people. They were instrumental in helping us to assemble a very usable, easily maintainable website for our organization. They' have demonstrated great flexibility in accommodating our evolving needs. They have been highly responsive to any technical issues, typically resolving them in less than 4 hours. Watermelon Web Works will make your organization better, and your CFO/Treasurer will be happy when they see the bill - what more can you ask for?
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