All three certificate types encrypt your connection identically. What differs is how much the certificate authority verifies about who's requesting it before issuing it.
Domain Validation (DV)
The CA only confirms you control the domain, usually via a DNS record or email. Issued in minutes, often free (Let's Encrypt). Fine for blogs, portfolios, and most small business sites.
Organization Validation (OV)
The CA additionally verifies the legal existence of your business against public registries. Takes 1-3 days. Common for company sites that want the organization name available in certificate details.
Extended Validation (EV)
The most rigorous check — legal, physical, and operational existence of the business is confirmed manually. Historically showed the company name in the browser bar; most browsers have since removed that visual distinction, so EV's practical benefit today is mainly the audit trail and trust for finance/e-commerce brands, not a UI badge.
How to tell which validation level a certificate actually has
Click the padlock in any browser, view the certificate details, and check the Subject field — a DV certificate's Subject typically contains little beyond the domain itself, while OV and EV certificates include verified organization name, location, and sometimes registration details directly in that field, reflecting the deeper validation those tiers underwent.
Why most of the web defaults to DV today
Free, automated DV issuance through Let's Encrypt and similar CAs removed both traditional barriers to HTTPS, cost and manual effort, which is why DV has become the overwhelming default across personal sites, blogs, and most small businesses. OV and EV remain relevant specifically where a compliance requirement, industry expectation, or internal policy calls for verified organizational identity, not because DV is in any way less secure.
A common point of confusion worth clearing up directly
Choosing a higher validation tier does not make your connection more encrypted or your server harder to hack — it only changes how much the CA verified about your organization's identity before issuing. Conflating validation level with security strength is one of the most persistent misunderstandings around certificate types, and it's worth being explicit that they're simply answering different questions.