What Is an SSL Certificate? The Complete SSL Guide

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What Is an SSL Certificate?

Short answer: SSL (Secure Sockets Layer) is an internet security technology that encrypts the data exchanged between your website and its visitors. It prevents information entered on your site — passwords, credit card numbers, contact form details — from being read by anyone else while it's in transit.

Once an SSL certificate is installed on a website, the address bar changes from HTTP to HTTPS (Hyper Text Transfer Protocol Secure). That single letter makes all the difference: it determines whether all of your site's traffic is encrypted. The most visible sign of this to users is the padlock icon that appears in the browser's address bar.

Think of it this way: a site without SSL is like a letter sent in an open envelope — anyone along the way can read it. A site with SSL is like a locked safe — only the party with the right key can see what's inside.

How Does SSL Work?

SSL relies on a pair of digital codes known as a “public key” and a “private key.” The public key is shared with whoever is sending data to you, and they use it to encrypt that data. The encrypted data can only be unlocked using the private key, which stays with you.

In practical terms: even if the data is intercepted while travelling across the internet, it's meaningless without the private key. Depending on the certificate, 128-bit or 256-bit encryption is used — the higher the number, the harder the encryption is to break. 256-bit encryption is, for all practical purposes, unbreakable with today's technology.

SSL vs TLS: What's the Difference?

Although the term “SSL” is still used everywhere — including in this guide, since it's what people search for — the protocol actually securing modern websites is TLS (Transport Layer Security), the technical successor to SSL. SSL itself was deprecated years ago due to known vulnerabilities, and every certificate authority today issues certificates that operate using TLS encryption. In other words, when you buy an “SSL certificate” from any provider, including Atak Domain, you're getting TLS encryption under a name the industry never stopped using. For everyday purposes the terms are interchangeable, and you don't need to do anything differently — but it's worth knowing if you ever see “TLS certificate” used instead of “SSL certificate.”

What Happens If Your Website Doesn't Have SSL?

A site without SSL fails to meet the basic security expectations of today's internet. In concrete terms, you'll run into:

If you're seeing this warning on your own site right now, the fix is simpler than it looks. Browse SSL Certificates → to pick the right certificate for your site and leave the installation to us.

Is Free SSL Enough, or Should You Buy a Paid Certificate?

This is the most practical question anyone researching SSL eventually asks. Free SSL certificates (such as Let's Encrypt) offer the same encryption strength as paid ones. But there are real differences:

In short: if you run a personal blog or a low-traffic informational site, free SSL is usually plenty. But if you collect payment information, need to build customer trust, or want to project a corporate identity, a paid DV, OV, or EV certificate is the sturdier choice.

Not sure which option is right for you? Don't worry — Atak Domain's support team will help you find the right fit.

SSL Certificate Types: DV vs OV vs EV

SSL certificates fall into three main categories based on how thoroughly they validate you. All three encrypt data with the same strength; what differs is how deeply the certificate authority verifies you and your company.

DV SSL (Domain Validation)

The fastest and most affordable option. The certificate authority only verifies that you own the domain, typically through an automated email or DNS check completed in minutes. Ideal for personal blogs, portfolio sites, and informational pages. Browse DV SSL options →

OV SSL (Organization Validation)

Adds a layer on top of domain validation: the certificate authority confirms your company is a legally registered, active business. The process takes a few business days but adds a visible trust layer for visitors who check your company details. As the most common business SSL certificate, it's recommended for membership sites and business websites. Browse OV SSL options →

EV SSL (Extended Validation)

The most rigorous validation process available. Your company's legal, physical, and operational existence is verified through a strict procedure. The result is the highest level of organizational trust, making it easier for visitors to verify the identity of the website owner. The standard choice for online banking, large e-commerce sites, and payment infrastructure. Browse EV SSL options →

Which Website Needs Which SSL?

Once you've decided, you can browse all options on the Atak Domain SSL Certificates page.

Which Is the Best SSL Certificate?

At Atak Domain, we manage the activation and installation of thousands of SSL certificates, and we offer solutions from leading certificate authorities including Comodo, DigiCert, GeoTrust, RapidSSL, and GlobalSign. One clear pattern we see in that process: e-commerce sites that process payments tend to upgrade from DV SSL to OV or EV SSL over time.

“Best” isn't a single brand — the right answer always depends on your needs:

Brand choice largely comes down to your budget and your business requirements:

Not sure which brand fits? Compare all options on the Atak Domain SSL Certificates page or get a recommendation from our support team.

When Do You Need Wildcard or Multi-Domain SSL?

If you run yoursite.com alongside subdomains like blog.yoursite.com or support.yoursite.com, buying a separate certificate for each one wastes both time and money. Wildcard SSL protects your main domain and all of its subdomains with a single certificate.

If you own entirely separate domains instead (for example, yourbrand.com and yourbrand.net), Multi-Domain SSL is the better fit — this certificate type can secure up to 250 different domains under a single certificate.

How Do You Buy and Install an SSL Certificate?

Getting SSL set up looks technical at first glance, but it really comes down to a few simple steps:

If you're installing it on your own server, our step-by-step guides make it easier: cPanel SSL installation, Plesk SSL installation, or Microsoft IIS SSL installation. Not sure which hosting setup you're on? Our Atak Domain Hosting team can walk you through the whole process.

How Much Does an SSL Certificate Cost?

SSL pricing depends on the validation level (DV, OV, EV) and the brand. If you're looking for a cheap SSL certificate, DV SSL is generally the most affordable option, while OV and EV SSL are priced higher due to their more thorough validation process. Here are current starting prices for some popular certificates at Atak Domain:

On top of these prices:

See current SSL prices and all packages →

Note: The prices above are accurate as of publication and may change based on brand, promotions, and currency fluctuations. Please check the pricing page for the most current figures.

SSL, HTTPS, and Google Rankings

Yes, using SSL is a search engine ranking signal. Search engines view sites running on HTTPS more favorably from a user-security standpoint. But it's not a magic SEO fix — it's one signal among others, including content quality, user experience, and page speed. That said, sites without HTTPS are at a real disadvantage in modern search results and may struggle to compete against secure websites covering the same topic.

Common SSL Errors and How to Fix Them

Even with SSL installed, browser errors can still occur. Here are the most common ones and the general direction for fixing them:

Seeing any of these errors and not sure how to fix it? Our Atak Domain support team can take a look free of charge.

Frequently Asked Questions

Is an SSL certificate mandatory?

It's not a legal requirement, but since browsers flag sites without SSL as “not secure,” it has become practically mandatory.

Does an SSL certificate affect search rankings?

Yes, HTTPS is a ranking signal, though it's not decisive on its own — it works alongside factors like content quality.

Is free SSL (Let's Encrypt) safe?

Yes, in terms of encryption strength. However, since it doesn't provide organization validation or a warranty, it may not be sufficient on its own for high-traffic commercial sites.

How long does it take for an SSL certificate to become active?

DV SSL activates within minutes; OV SSL usually takes a few business days; EV SSL can take up to a week depending on documentation.

Is SSL the same thing as HTTPS?

No, they're not the same. SSL (and its modern successor, TLS) is the encryption technology behind HTTPS; HTTPS is the name of the secure connection protocol that uses that encryption.

What's the difference between SSL and TLS?

TLS is the technical successor to SSL and is what actually secures modern websites; SSL itself was deprecated years ago. The industry still calls them “SSL certificates” out of habit, but they run on TLS encryption.

Can credit card information be collected without SSL?

Technically yes, but it's a serious security vulnerability and generally violates payment processors' security standards. Running a payment system without SSL is not recommended in practice.

What's the difference between DV, OV, and EV SSL?

All three encrypt data with the same strength; the difference is the depth of identity validation. DV verifies only the domain, OV verifies the company, and EV verifies the company under the strictest standard.

What happens if my SSL certificate expires?

Browsers will flag your site as “not secure” again, which can lead to visitor loss and lower conversions. That's why tracking your renewal date matters.

My SSL is installed but my site still shows a “not secure” warning — why?

This is usually a Mixed Content Error: the page loads over HTTPS, but some images or scripts are still being called over HTTP. Updating those resources to HTTPS fixes it.

When do I need Wildcard SSL, and how many subdomains does it cover?

If you have multiple subdomains (mail., blog., support., etc.), a single Wildcard SSL certificate can cover an unlimited number of subdomains under the same main domain.

Which is the best SSL certificate?

There's no single “best” brand — the right choice depends on your needs. Comodo PositiveSSL or RapidSSL for blogs, GeoTrust for business sites, and DigiCert or GlobalSign for e-commerce and high-security projects are common picks.

Do I need technical knowledge to install SSL?

No. Certificates purchased through Atak Domain are installed for you, free of charge.

What happens to my SSL certificate if I switch hosting providers?

As long as you have the private key, the certificate file, and the intermediate certificates, you can move your certificate to your new server.

Conclusion: Secure Your Website Today

A website security certificate — what most people simply call an SSL certificate — is no longer an “optional detail.” It's the foundation of earning visitor trust, protecting data, and staying competitive in search rankings. You now know which type fits your site and how the process works; the only thing left is taking the first step.