SSL (Secure Sockets Layer) is a security protocol used to encrypt communication between a web server and a client, usually a browser. Its main purpose is to protect data transmitted over the internet from being intercepted or modified.
Although the term SSL is still widely used, modern systems typically use its successor, TLS (Transport Layer Security). In practice, both terms are often used interchangeably in hosting environments.
Table of Contents
How SSL works
When a secure connection is established:
- the browser connects to the server
- the server presents a digital certificate
- the certificate verifies the identity of the server
- encrypted communication is established between both sides
This process ensures that data exchanged during the session remains private and protected.
SSL certificates
SSL relies on certificates issued by trusted certificate authorities. These certificates:
- confirm the identity of the domain or organization
- enable encryption of transmitted data
- help browsers verify that the connection is legitimate
When a certificate is valid, the browser displays a secure connection indicator.
SSL vs HTTPS
SSL ≠ HTTPS
- SSL is the encryption technology (protocol)
- HTTPS is HTTP running over SSL/TLS encryption
In other words, HTTPS is the result of using SSL/TLS on a website connection.
Practical use cases
SSL/TLS is used in:
- securing website traffic (login pages, forms, payments)
- protecting user data during transmission
- securing email communication protocols
- API communication between services
Practical implications
Without SSL/TLS encryption, data transmitted between the user and server can be exposed to third parties.
For this reason, modern browsers may mark non-secure HTTP connections as unsafe.
Most hosting environments, including mybox, support automatic or manually installed SSL certificates for domains.
Summary
SSL is a protocol that enables encrypted communication between a server and a client. It ensures data privacy, integrity, and authentication during internet communication.