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What Is SSL Certificate?
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Updated 18 September 2026
Quick Answer
An SSL certificate is the technology that encrypts data between a visitor's browser and your website, shown to visitors as the padlock icon and 'https://' in the address bar.
SSL vs. HTTPS — What's the Difference?
| SSL | HTTPS | |
|---|---|---|
| What it is | The certificate/technology itself | The protocol enabled by having a valid SSL certificate |
Why It Matters
- A visitor who sees 'Not Secure' next to your domain — especially on a page asking for card details — will often leave immediately.
- Google factors HTTPS into search rankings, so a missing certificate can quietly cost you visibility too.
How It Works
- An SSL certificate encrypts information as it travels between a visitor's browser and your server.
- This prevents it from being intercepted in transit.
- Most modern hosts and platforms now issue and renew certificates automatically at no extra cost.
Key Takeaways
- SSL encrypts data between a visitor's browser and your site.
- Most platforms now include and renew it automatically at no extra cost.
- A missing or expired certificate actively costs both trust and search visibility.
Frequently Asked Questions
Do I have to pay extra for SSL?
Usually not — most platforms and hosts now include it free and renew it automatically.
What happens if my SSL certificate expires?
Visitors see a security warning and most browsers block them from proceeding without clicking through a warning page.
Does SSL affect my Google ranking?
Yes, though modestly — it's one of many ranking factors, but a missing one is an easy, avoidable penalty.