What Is an SSL Certificate and Why Does Your Website Need One?

1. SSL and TLS Explained

SSL stands for Secure Sockets Layer, a security protocol originally developed in the 1990s to encrypt communications between web servers and browsers. The modern version of this protocol is actually called TLS, or Transport Layer Security, but the industry still commonly refers to it as SSL. When someone mentions an SSL certificate, they are referring to a digital certificate that enables TLS encryption.

The purpose of SSL/TLS is to create a secure, encrypted connection so that data travelling between your website and a visitor cannot be read or tampered with by anyone intercepting the transmission. This protects sensitive information such as login credentials, credit card numbers, personal details, and form submissions.

2. How SSL Encryption Works

When a visitor connects to your HTTPS-enabled website, a process called the SSL handshake occurs. The browser requests your server to identify itself. The server responds by sending a copy of its SSL certificate, which contains a public encryption key. The browser verifies the certificate is valid and issued by a trusted Certificate Authority.

Once verified, the browser and server establish an encrypted session using symmetric encryption keys. All data transmitted during the session is encrypted, making it unreadable to anyone who might intercept it. This entire handshake process happens in milliseconds and is invisible to the visitor.

Without SSL, data is transmitted in plain text. Anyone on the same network, such as a public Wi-Fi hotspot, could potentially capture and read everything being sent between the visitor and your website. SSL eliminates this risk entirely.

3. Types of SSL Certificates

Domain Validated certificates are the most basic and most common type. They verify only that you own the domain name. Validation takes minutes and is fully automated. DV certificates are free through providers like Let's Encrypt and are included with BearHost hosting plans. They are ideal for blogs, personal websites, and small business sites.

Organisation Validated certificates require the Certificate Authority to verify your business identity in addition to domain ownership. This process takes one to three days and requires submitting business documentation. OV certificates display your organisation name in the certificate details, providing an extra layer of trust for business websites.

Extended Validation certificates involve the most rigorous verification process, including legal entity verification, physical address confirmation, and operational checks. EV certificates historically displayed the company name in a green address bar, though modern browsers have moved away from this visual indicator. EV certificates are used by banks, large e-commerce sites, and organisations handling highly sensitive data.

4. Free vs Paid SSL Certificates

Free SSL certificates from Let's Encrypt provide the same level of encryption as paid certificates. The encryption strength is identical. For most websites, a free DV certificate provides everything you need. BearHost automatically installs and renews free Let's Encrypt SSL certificates on all hosting accounts.

Paid SSL certificates offer advantages in specific situations. OV and EV certificates are only available as paid options because they require manual verification by the Certificate Authority. Some paid certificates also include warranty coverage, meaning the Certificate Authority will compensate you financially if their certificate fails and causes a breach.

For the vast majority of websites, including business sites, blogs, and standard e-commerce stores, a free DV SSL certificate is sufficient. Only pursue paid OV or EV certificates if your business specifically requires the enhanced validation for compliance or customer confidence reasons.

5. SEO Benefits of SSL

Google confirmed HTTPS as a ranking signal back in 2014, and its importance has only grown since. Websites with SSL certificates receive a measurable ranking boost in search results compared to identical non-HTTPS sites. While SSL alone will not catapult you to the first page, it is a factor that contributes to your overall SEO performance.

Beyond direct ranking signals, HTTPS improves other metrics that influence SEO. Visitors are more likely to stay on a secure site, reducing bounce rates. They are more likely to complete forms, make purchases, and engage with content when they see the padlock icon. These positive user behaviour signals further reinforce your search rankings.

6. Browser Trust Indicators

Modern browsers make the security status of a website immediately visible to visitors. HTTPS-enabled sites display a padlock icon in the address bar, signalling that the connection is encrypted and secure. Clicking the padlock reveals certificate details and confirms the site identity.

Websites without SSL certificates receive a "Not Secure" warning in Chrome, Firefox, Safari, and Edge. This warning appears prominently in the address bar and can also trigger full-page interstitial warnings for certain interactions like form submissions. These warnings significantly damage visitor trust and cause many users to leave the site immediately.

For e-commerce websites, the impact is even more severe. Customers will not enter payment details on a site flagged as insecure. A missing SSL certificate can single-handedly kill your online sales.

7. Installing SSL on Your Website

With BearHost, SSL installation is completely automatic. When you add a domain to your hosting account, a free Let's Encrypt SSL certificate is generated, installed, and configured without any action required on your part. Certificates renew automatically every 90 days, so you never have to worry about expiration.

If you are using another hosting provider, SSL installation typically involves generating a Certificate Signing Request from your server, submitting it to a Certificate Authority, receiving the certificate files, and installing them through your control panel or server configuration. The process varies by provider and can be technically challenging.

After installing SSL, ensure your website redirects all HTTP traffic to HTTPS using 301 redirects. Update your sitemap, internal links, and any hardcoded URLs to use HTTPS. For WordPress sites, plugins like Really Simple SSL handle this configuration automatically.