When someone tells you their website, the last piece — the .com, the .org, the .net — is called a TLD. It stands for top-level domain, and it's essentially the last name of a web address.

So in marshland.software, the TLD is .software. In wikipedia.org, it's .org. That's it. Not complicated, but the extension you pick does carry some weight, especially when you're building a brand from scratch.

The Most Common TLDs (and What They're Actually For)

.com — The default. Short for "commercial," it was originally meant for businesses, but that ship sailed long ago. Today it's just what people expect. If someone hears your brand name and types it into a browser, they will almost certainly try .com first. That's not a rule; it's just habit baked into a few decades of internet use.

.net — Originally for networking and infrastructure companies. These days it functions as a fallback when the .com version of a name is taken. It's credible, widely recognized, and fine for most businesses — just not as instinctive as .com.

.org — Meant for nonprofits and organizations. It carries a specific association: people tend to assume .org means "not trying to sell me something." That trust is valuable if you're running a nonprofit, church, or community group. Less appropriate if you're a for-profit business.

.io — Technically the country code for the British Indian Ocean Territory, but the tech world claimed it years ago. "IO" maps to input/output, which is why startups and SaaS products love it. If you're building software tools or a developer-facing product, .io is a well-understood signal.

.dev and .app — Google runs both of these. They're newer, clean, and carry an obvious meaning. .dev fits developer tools and portfolios; .app works well for mobile or web applications. Both require HTTPS by default, which is a minor but nice bonus.

.co — Short, looks like "company," and is the official TLD for Colombia. The startup world adopted it as a stylish alternative to .com. It's a legitimate choice, though you'll want to make sure customers don't accidentally type .com and land on someone else's site.

Descriptive TLDs like .software, .studio, .agency — There are now over a thousand TLDs available, and a good one can make your domain pull double duty. Our own site is marshland.software. The TLD is literally the last word of the company name (Marshland Software), so the domain and the brand are the same thing read two different ways. You can get creative with combinations where the domain reads as a phrase: build.software, my.agency, great.studio. One practical note: we also own marshlandsoftware.com as a redirect. If you go with a descriptive TLD, registering the .com version and pointing it at your real domain is worth the $15/year — some people will type .com on instinct no matter what. And do check whether your audience will recognize the extension. Some people still hesitate at anything that isn't .com.

Generic vs. Country-Code TLDs

There's a technical distinction worth knowing. TLDs fall into two broad buckets:

  • gTLDs (generic top-level domains) — .com, .net, .org, .io, and all the descriptive ones. Not tied to any country.
  • ccTLDs (country-code top-level domains) — Two-letter extensions assigned to specific countries: .us (United States), .uk (United Kingdom), .ca (Canada), .au (Australia). Some businesses use these intentionally to signal local presence; others use them purely for style (.io and .co started as ccTLDs before the internet repurposed them).

For most small businesses in the US, a ccTLD isn't necessary. Stick with a gTLD unless you have a specific reason to signal a particular country.

How to Actually Choose

Here's the honest decision tree:

  1. Is the .com version of your name available? Take it. Don't overthink it.
  2. If .com is taken, is .net or .co available with the same name? Either works, just make sure the .com version isn't owned by a competitor in your space.
  3. If you're a nonprofit, .org is the right call regardless of whether .com is available.
  4. If you're a tech company or developer tool, .io, .dev, or .app are legitimate first choices, not fallbacks.
  5. Descriptive TLDs like .agency or .studio work if your brand name is short and the full domain reads naturally out loud.

One thing to test: say your domain out loud to someone who hasn't seen it written down. If they'd reasonably spell it differently, that's a problem worth solving before you print it on anything.

Not sure what's available for the name you have in mind? Use our free domain checker to see what's taken and what isn't across all the major extensions.

Does Your TLD Affect SEO?

Short answer: not much, but there's a nuance.

Google has said publicly that .com doesn't rank higher than .net or .io just because of the extension. The algorithm doesn't show favoritism to the classic TLDs. What matters is the content, the links pointing to you, and the overall authority of the site.

That said, .com has a brand trust advantage that's hard to quantify. People click .com links more readily. They remember .com addresses more easily. If two search results look equally credible, the .com one might get the click. It's not an SEO factor in the technical sense; it's a human behavior factor.

Country-code TLDs like .uk or .ca do get a mild boost in local search results for that country. Google treats the ccTLD as a signal that the site is meant for that audience. Useful if you're deliberately targeting one country; irrelevant otherwise.

One Gotcha Nobody Warns You About: Email Validation

If you use a newer TLD as your email address, some software out there won't accept it as valid.

I found this out firsthand. I was trying to log into a bank using josh@marshland.software and kept hitting odd errors. The address worked to login and silently failed on others. I could not set my statements to be online only. So, end of month comes and I get a $7 charge for 'paper statements.' After an embarrassingly long call with a bank representative, we tracked down the problem: their system was rejecting my email address as invalid. Not because anything was wrong with it, but because someone had written an email validator that only recognized a fixed list of extensions like .com, .net, and .org. And naturally they neglected to share a proper error. Just a classic "We're having issues, try again in a few minutes."

This is more common than you'd expect. Writing a correct email validator is genuinely annoying, so developers sometimes shortcut it by checking for a known list of TLDs. Technically wrong, but it's sitting in production code at real companies, especially non 'tech' firms like: banks, government forms and more 'stodgy' businesses.

So if you pick a newer TLD for your primary email, know that you may occasionally hit a form that rejects it. Having a .com address as a backup for those situations is worth keeping around.

The Bottom Line

Your TLD matters, but it's not the most important decision you'll make about your domain. Pick something your customers can remember, spell, and find. .com is the easiest bet if it's available. Everything else is a reasonable tradeoff depending on your industry and audience.

Once you've got the extension figured out, you still need a name — and that part is usually harder. Check out our guide on how to check domain availability for a full walkthrough of finding and securing a domain name that actually fits your business.

And if you're ready to stop comparing options and just get something live, our hosting plans include a domain so you can take care of both in one place.