SSL (Secure Sockets Layer) is a security technology that creates an encrypted connection between a web server and a user’s browser. This encryption ensures that all data transmitted between the server and the browser remains private and secure.

Today, SSL has mostly been replaced by the newer protocol TLS, but people still commonly use the term SSL to refer to website security certificates.

When a website uses SSL, its URL changes from HTTP to HTTPS, and a padlock icon appears in the browser address bar.

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Function of SSL

SSL performs several important security functions:

1. Encryption

   • SSL encrypts the data sent between the user and the server.

   • This prevents hackers from reading sensitive information such as passwords, credit card numbers, or personal details.

2. Authentication

   • SSL verifies that the website actually belongs to the organization it claims to represent.

   • This helps prevent users from visiting fake or phishing websites.

3. Data Integrity

   • SSL ensures that the data transferred between the browser and server is not modified or corrupted during transmission.

4. Trust and Credibility

   • Websites with SSL certificates show HTTPS and a padlock icon, which increases user trust.

5. SEO Benefits

   • Search engines like Google consider HTTPS as a ranking factor, so SSL helps improve website SEO.

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Types of SSL Certificates

There are three main types of SSL certificates based on the level of validation.

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1. DV SSL (Domain Validation)

Domain Validation SSL

DV SSL is the basic and fastest type of SSL certificate.

Features

• Only verifies domain ownership

• Issued within a few minutes

• Lowest cost (sometimes free)

• Shows HTTPS and padlock icon

Best For

• Personal websites

• Blogs

• Small websites

• Testing environments

Limitation

It does not verify the company or organization, so visitors cannot confirm who owns the website.

Example providers:

• Let’s Encrypt (Free DV SSL)

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2. OV SSL (Organization Validation)

Organization Validation SSL

OV SSL provides a higher level of security than DV SSL.

Features

• Verifies domain ownership

• Verifies business/organization identity

• Visitors can see verified company information

• Moderate cost

Best For

• Business websites

• Company websites

• NGO or institutional sites

Advantage

Users know that the website belongs to a real registered organization.

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3. EV SSL (Extended Validation)

Extended Validation SSL

EV SSL provides the highest level of website trust and security.

Features

• Strict verification process

• Confirms legal, physical, and operational existence of the company

• Shows company name in the browser address bar (in some browsers)

• Highest level of encryption and trust

Best For

• E-commerce websites

• Online banking

• Payment gateways

• Large corporate websites

Advantage

Users immediately know the website belongs to a legitimate and verified company.

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Comparison Table

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✅ Simple Summary

• DV SSL → Basic security

• OV SSL → Business verification

• EV SSL → Maximum trust and security